2009 Honda Civic A/C won’t work after replacing compressor

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Edited by: Francisco Diez Video & Photography

[@MarketingCoachKen]

2009 Civic is a fan favorite. Good to see an a/c repair on one of the most popular cars on the road.

[@JesseAutoDiag]

If I was yor typical mechanic at the Dealership, I would replace the AC Compressor, PCM/ECM, BCM & AC Amplifier/ Module, Head Unit, and Engine Harness, and if that dont fix it, I may throw in a Transmission + TCM or even a fuel pump at no charge and depending if any leaks maybe even a power steering pump and hoses, and on a good day an alternator. but It'll have cold air on the way out for $6,500 + tax.... Thanx for the great Diag Videos Mr Oz... :)

[@Giardintek]

Good job Oz! This makes that prev shop look real bad, and I can tell you most shops will start replacing the most expensive components, instead of doing the obvious. If every mechanic was like you, Ppl would trust repair shops more. Thank you..

[@chuckvoss9344]

Good job. Your using the scan tool to step through the process saved you a lot of time.

[@OzMechanics]

Thanks for stopping by and watching. Hope all is well

[@billrimmer5596]

Very nice diag!!! The debris was evidence that the compressor failed and that in turn plugged the condenser. I recently did an Accord of the same year. The desiccant bag on the side of the condenser failed and plugged at least half the condenser with a million little balls. Before replacing the condenser my high side gauge wasn’t reading high at all. Remember, the pressure switch/transducer is downstream of the condenser. Also, the high side pressure access port is also downstream of the condenser. BEFORE I replaced the condenser and flushed the rest of the system the high side gauge read low pressure and the pressure relief blow off valve was venting the high pressure. That was scary!! POW, pow. New condenser and flush fixed the system. Works fine now. That pressure relief valve is super important. Years ago a Chrysler blew the compressor to smitherines while I was sitting in the driver seat after charging it. It had a bad expansion valve. The explosion scared my wife who was in the house about 100 feet from my shop. Refrigerant oil was everywhere!! What a scary mess that was.

[@Jonathan-pr1wo]

Just had my 06 AC compressor and condensor replaced. Was told once the compressor goes bad that they also need to replace the condensor as there could be debri from the compressor that got into the condensor and if a new compressor were to be replaced only it could damage it.

[@DuaneDonaldson]

AC Systems are a major problem for many Techs to understand the actual LOGIC within the HVAC Head Control Unit mixed in with the PCM and possible BCM for many vehicles. Not all scan tools will show 100% of all sensors involved and we also do not know all the sensors involved, hence the problem many of us have of not fully understanding the entire system, especially when the scanner is not informing us of EVERYTHING we need to see. Most of us do not care to read up on the Service Info to be better educated on the system and different makers use different LOGIC increasing the difficulty of becoming HVAC professionals. Some scanners do not show the EVAP Temp Sensor PID, if it is not working properly the LOGIC in the Head Unit will not allow the PCM to turn on the Compressor, not because the PCM blocks the signal, but because the Head Unit does not send a signal to the PCM. Many Techs can see that this output from the Head Unit is missing, but they don't know why, so they swap in a new/used Head Unit when the actual problem is a sensor that the Scanner does not have a PID for. There may be an Ambient Temp Sensor in an outside mirror assy that is bad, how many Techs know to look for this, it's all about proper training on all makes which can take years to learn on such a seemingly simple system. On some late-model cars, the HVAC is now affecting other systems that are totally unrelated, & shutting them down, it's getting crazy. The Engineers are forcing people back to the Dealer to get repairs because the HVAC is shutting down the ABS and TRAC, etc. Why hook up gauges this early, the pressure switch or transducer will give you the proper PID data, either the switch is on or pressure is within limits, and deeper diag comes later if you don't trust the scanner readings. HIGH & LOW AC pressures are about equal so the system has evened out static, pressures are trustworthy at this point. There you go, AC pressure transducer 500PSI, way too high to allow the system to turn on based on proper LOGIC in the Head Unit. AC Pressure Sensor almost 5V, also too high. We need to spend more time creating our own Custom PID Data Listings per vehicle so we know what a normal hot day AC Pressure Sensor Static reading ought to be but in this case, the 500PSI is a dead giveaway. After watching 10s of thousands of KZbin videos Bro, the code readings need to be around the 1-minute mark on average of your video, here you are 8 minutes in, some systems will not allow the system to operate based on codes being present, not saying this is the case but, #1 verify customers complaint/symptoms, #2 scan for codes. We all have our own set of rules to follow, the real-world problem is when we throw out our own rules and don't follow our own tried and true proven set of rules step by step. Also in the real world, if we charge for the first hour of diag, at least this job can be diagnosed in one hour. Thank you for verifying the 2.5V (correct V ??) is a BIAS, using a test light as a load is another test to pull down the BIAS. I wish that you would have retested the 2.5V BIAS with a good Head Unit. I wish you would have tested the missing voltage not going into the connector of the Head Unit and maybe jumped it in at that location. This follows what I mentioned missing LOGIC not allowing the system on signal being sent to the PCM. Thank you for showing that the AC Pressure Transducer Voltage is Proportional to the system pressure output, as pressure increases, the voltage increases. We love to see all tests showing a bad system are then retested to show a good system so we know what to look for mainly for the younger troops. WHO is paying you, the owner who should be getting warranty work, or the shop is paying you to cover the warranty? Not a real problem but I notice that not many techs frequently recheck for new codes once in a while during maintenance. Sometimes this matters. I love your channel Bro, wish you could post many more videos, you are located a ways down my listing mainly based on the number of videos per year but your overall rating of usefulness to an experienced tech is 65% which is good but quantity out-weighs usefulness in my library. I dont care for DIY type stuff and tool reviews, need to have some of the 4 S's, scanner scope schematics and service info. Thank you for all that you do. To give you some data, I just dropped Rainman Ray to your level as he was #1 but he does a lot of regular maintenance and no deep diag. I also have you one level above Super Mario and SD because they don't upload much anymore, too sad. You did not average 2 videos per month in 2023, can you increase it to 1 per week, it would really help your ratings to all viewers, I am sure, cheers.

[@randyf929RR]

Actual constructive criticism. 🙏 Completion on both ends; This is what makes the world go round! 🙏

[@orinmangar2333]

Could it have been a faulty head unit in the beginning? If so, changing out the ac compressor and other parts were expensive and possibly unnecessary. It is important to get you to diagnose b4 replacing parts. Great job Oz.

[@carolchia1001]

Could have been, but these Hondas are known to kill ac compressors so judging by the junk he found in the sensor port the old one probably had failed or was about to fail so either way, looks like they needed the replacement. Hopefully all the flushes helped keep the new compressor alive!

[@edwardthayer9386]

I HIGHLY doubt they flushed it!🤦‍♂️ OZ you are a great technician and you are really good at these videos! Your attitude is everything!👑 people think I'm weird when I get so excited about fixing things! I laugh also when you get hype!

[@JimmyMakingitwork]

It can confuse many mechanics when the sensor and pressure port are far away from each other. ;) Always check codes guys on any modern car before hooking up the AC machine. Nice work!

[@advancedleveldiagnostics]

Great job, thanks for sharing! The only thing I would have done differently, which you probably did off camera is check the ground for the controls.

[@OzMechanics]

Yea, that shot was actually recorded but with no audio that’s why I put that transition point with the black screen. And just put customer agreed

[@israelperez-sg8er]

Congratulations, great job! You´re a very patient man in your work, viewing from Guatemala, C.A.

[@mmichaeldonavon]

Very nice diag. Had several problems - you found them. Good job.

[@OzMechanics]

Thanks. This one was for sure a fun one to fix and film

[@ohwhen2485]

Most Honda’s AC Systems are very problematic with my experience. New and old. 🤦🏻‍♂️

[@fredsalter1915]

So close to 100k!!! PS- Ivan would have opened the HVAC head unit ;-) Rock on, Oz!!!!

[@OzMechanics]

Actually got to hang out with Ivan 2 weeks ago. Pretty cool guy

[@fredsalter1915]

@@OzMechanics You got to meet the rock star?!? You lucky!!! God bless, Oz!!

[@scientist100]

Unfortunately with these; they are microchips and not mechanical switches that provides continuity. They are ground driven as he shows. The module recognizes the button push and toggles on or off as it is pressed. Holding it down does nothing but change the status on or off.

[@russellhltn1396]

Interesting. Given the scanner status for the "A/C switch" changed when you grounded it, it suggests it's not really a computer input, but rather a voltage measurement at that point.

[@nightwolf29]

Good job on the diagnostic! Great video as always!

[@OzMechanics]

Thanks for stopping by nightwolf

[@mikechiodetti4482]

I think you diagnosed it correctly. Ya the clutch would engage with your diagnosis tool, but the false reading of over 400 psi was one problem. Then comes the test. Surprise! Bad dash switch. No one knew that switch was bad, so you diagnosed that part properly! Overall....GOOD JOB! On to the next one.

[@artiemejia3695]

Great work! I’m having a similar issue with a 2010 civic.

[@BrianleiverOros]

Thank you!!!! I like how you teach. 😁😁👍👍

[@davidgriffin14]

You and Eric need to do another video together.

[@OzMechanics]

We need to get in Eric’s KZbin page and push this

[@scientist100]

You should have tested the input integrity of the switch head unit. There are two inputs and outputs for this. One to illuminate the button itself and the other to the hvac module. These cars are complex and im glad it wasnt a wiring issue. One thing i also learned, some cars are crazy where you dont know what else the modules are monitoring prior enabling the switch to request ac compressor on; not easy if tech info is not available.

[@bartscave]

Thanks for sharing! Excellent diagnosis and video.

[@OzMechanics]

Thanks for stopping by and watching

[@Cheeky_Goose]

Love your detective work! So are you like an AC specialist that different shops come to when they can't diagnose an issue? I hope they pay you well

[@OzMechanics]

I own my shop and other shops call me when they have problems. I actually just uploaded a video where I’m filming at another shop

[@adnerflores2827]

El compressor/expansion valve/ Filtor de condensador/ los empaces del compressor/ y el acite/ y freon a question master, I changed all this to my 2011 honda civic but I still feel like the a/c lacks more power, it doesn't cool enough, what could it be???

[@arahtson1]

Hey, I just got the same scanner model a with a scope is any way can shows how did you connected to do those reading?

[@Tacosauce22]

I think the shop loaded up the parts canon without a real diagnosis. The old compressor was probably good and nothing wrong with it. Good fix dude.

[@OzMechanics]

The metal residual shows that compressor damage did happen but I’m not sure if this was from an old issue

[@jameslewis1175]

The control is a known issue in these but also i have had several aftermarket compressors with a bad sensor. I always just swap with the original

[@The_Touring_Jedi]

I have 9th Gen European model 1.8iVtec Civic. I did changed fluid and in the shop they told no leakage...but. I have a feeling that on outside ambient temp of 23-25°C it needs some time to blow really cold. it's 2014 model low mileage. Looks almost brand new. I have checked behaviour of compressor. If set to blow low at 17°c the compresor switch on/off in like 5 seconds delay. But if I turn auto on 17°C the compressor stay on whole time and it switches on cabine circulation only. I had newer car model with latest generation of refrigirant like VW and Mercedes has they blew really cold in just seconds. Civic has old refrigirant R134 do I guess it needs some time to blow really cold air.

[@edwinmartinez1756]

excellent diag skills my bro!

[@OzMechanics]

Thanks for watching Edwin

[@faroukkhan6777]

Thanks Oz keep up with all your great work,, 👌

[@Usmanthemecano]

The takeaway is: ac request should change in scan data with key on engine off if hvac unit works properly

[@mikethompson3534]

Excellent troubleshooting

[@edobrador8112]

Does the compressor have to be on to recharge the system?

[@machineman6498]

Well, that was humbling. DIY here with a 2010 civic and had no idea the control aside from a gauge and clicking clutch.

[@bhadz100]

What could be the issue if it only blows cold air when rpm is up and not when idling?

[@borgsimpson935]

Diag great info. Excellent tutorial

[@OzMechanics]

Thanks borg. This was a fun one to film

[@themechanic6117]

Nice work

[@OzMechanics]

Thanks. This one was a fun one

[@jamesbroomfield7799]

Yo. When you first start the car, was the clutch and fans spinning then stopped after 10 sec or so? Or were they just not coming on at all? Im dealing with a 06 civic hybrid that had some front end damage that needed new condenser and compressor etc. Got everything replaced, including new pressure switch, but now i turn on car and everything runs for 10 seconds then shuts off. Then i have to restart car and it repeats. I jumped the fan and clutch and ac worked great the pressures looked normal. Any ideas? I don't have the big scan tool like yours though, so if you have any advice on what to do next itd be much appreciated

[@aaronkoivu]

93psi when ac compressor is off, that the same ambient temperature 93F….is this a quick check that the sensor wiring is good? Good ground? Good computer? Chrysler technology teacher show this test to the class when this transducer 3wire system was installed on the LH(300M) plate form back in 1998

[@alexandermartinez4800]

Gracias entonces eses el problema de mi civic 06

[@renj6531]

you have the part number for the control unit. I think mines is bad because I replaced the blend door actuator and when I press the floor and defrost button the motor dosnt move I bench tested the motor and it worked which tells me its a control issue

[@OzMechanics]

Honestly I forgot. But if you call the dealership and give them your vin they will give you the proper part. It’s not crazy expensive

[@edwardthayer9386]

NO NO NO NO!!!! Your skills are why you are there!!!!

[@aaronkoivu]

4.98volts is that open circuit or 5.0 volts

[@user-dl2ef8bw9f]

Oz mechanic good job, thank you

[@joserivera6523]

That's why is good to do a dionostic always good one oz

[@davidche554]

Hello I had a question why did you replace the ac switch without test the circuit of the switch?

[@OzMechanics]

I recorded that part but had no audio and scrapped that part. That’s why on the transition I just put a black screen and said customer agreed on the ac unit. Hope this answers your question

[@jayceasar2661]

great work bro

[@shaunblakemore7150]

Great job 👍

[@OzMechanics]

Thanks for watching Shaun

[@GkbjlgGkbgljg-my8jc]

Thanks for you vidéo 😉👍

[@oldbiker9739]

nice work .

[@OzMechanics]

Thank you for stopping by

[@jar6588]

Well this vid made me subscribe ,great job bro✌️🍺🇺🇸

[@OzMechanics]

New one coming out in a bit

[@jar6588]

@@OzMechanics 👍 Orale

[@AdrianGonzalez-eh9im]

Goodjob amigo

[@lindseywhite7852]

Check the radiator fluid it will not blow cold if it is low had 2008 the dealer replaced everything it would not get cold until it checked and filled the radiator

[@hilariomartinez8220]

You should ask your customers what shops they did take there vehicle to become then you could make a list to show your viewers where not to take there vehicles because they don't have technicians that are worthy of calling themselves technicians I find it so hard to understand how people pay so much money on diagnostics just to have your vehicle returned in the same position or worse

[@OzMechanics]

This car came from another shop so I never really spoke to the customer. And I think this is the reason we as shops need to charge accordingly when it comes to performing a diagnostics.

[@luismarty1685]

Fantastic bro.

[@mike-yp1uk]

Good fix

[@balajikuppusamy1642]

In my 2010 model civic, the cold air cut off after 45 min and no air blew from the vent. Replaced Evaporator sensor and blower motor resistor but still the same problem continues. If I switch off AC and ON after 10 mins, everything works very well for 40 to 50 mins and again the same problem continues. Can you please suggest me a solution for this?

[@idkcheesecake5080]

Relay

[@user-te3pn4pb4u]

i would say they were guessing cause they should have caught the pressure transducer hi pressure after they replaced it. so that tells me they did not check the original one as well ,cause they would have caught that to if it was hi or correct, i always gather the data before and after a repair cause you are always looking for a difference in data after a repair, if it does not change then you did not find your issue. that's why i say they were guessing

[@rrmech11]

Hey Oz. Your from Houston right? I went to school in Bellaire TX. I was in the autoshop class.

[@OzMechanics]

Yes sr. I’m on the southeast side. Awesome

[@rrmech11]

@@OzMechanics I lived in sharptown

[@GraditelMacedonia]

Probably that sensor is good, but are opposed, for other system type.

[@H8HotWeather]

I have a 2003 rsx I turn on the ac and it blows cold for a minute and then it blows hot. Any idea what this could mean?

[@The_Touring_Jedi]

Compressor sensor or high low pressure valve.

[@larrystephens7437]

And the original problem was? Parts cannon.... Well done diag...

[@OzMechanics]

Lmao 🤣 parts canon booooom

[@swav100]

What kind of suitcase is that

[@porky7753]

Great job Mr Oz, you deserve a ticket on the tequila train.

[@OzMechanics]

You know what porky. I’m down for another tequila trip

[@martinarrieta248]

Grasias

[@OzMechanics]

Gracias a ti. Por pasar

[@ebrahimsadeghi5883]

Awesome 👏 ❤

[@sheerwillsurvival2064]

The rockets 🤠

[@OzMechanics]

Heck yea. I had basketball shorts and crocs on this video

[@sheerwillsurvival2064]

@@OzMechanics 👊🏻🤠

[@aymenmohamed1134]

Awesome

[@Really658]

Aftermarket. Been there.

[@OzMechanics]

Yea. I’ve seen a lot of crazy stuff when it comes to aftermarket

[@jonesy4588]

just normal for them

[@gautorepair]

chinesium strikes again bro! lol.

[@OzMechanics]

For sure. I think the aftermarket one was 18 and oem ran 96

[@gautorepair]

@@OzMechanics yeah thats the detail right there. The aftermarket prices are way too appealing. But when you get a bad one it all goes down the crapper. Has happened to me several times. It seems to me the pandemic made it worse.

[@avenger1888]

Oz I think the head unit was fine. The problem with the air conditioner is thaf someone dies kniw how to use it. I watched your video and not sure if others noticed but on the original head unit the air circulating button was high lighted not the air vents ( windshield vents or the cabin air vents. ) When you replace the head unit the compartment air circulating button was off and the air vents was turned on. If Im correct for the air conditioner to work you need to select the air vent NOT the circulation button. So I think everyone overlooked that and put parts and time into something that was simple just switching the control from circulating to cabin air vent.

[@OzMechanics]

That is wrong circulation button will not effect the a/c being on or off. You can try that on your vehicle. Hope this answers your question

[@nickayivor8432]

Enjoy your weekend with all your family around you, Oz Mechanics 👍 SHREWD, Oz Mechanics From Nick Ayivor from London England UK 🇬🇧 ⏰️ 23:52pm good night 😴 🥱

[@OzMechanics]

Thanks for stopping by Nick. Hope you are your family are doing great

[@edwardthayer9386]

Im willing to bet it never needed a compressor!🤦‍♂️