Why Car Overheating After Replacing Radiator, Water Pump, Thermostat, Or A Coolant Hose

[@robertdiehl9003]

Air in coolant system will even cause idling issues. Found out the hard way on 1999 Honda Accord after replacing radiator. I forgot that coolant travels thru idle air control valve which communicates with PCM. Great video

[@motorcarnut]

Thank you! Great point!

[@VicesN2Virtues]

Just got a 95 Chevy G20, previous owner said recent water pump, head gasket, radiator. Running just fine, but coolant looked nasty. I drained the coolant with a bunch of rusty stuff. So I ran a coolant flush through for 3 hours and everything was fine. Drained that. Flushed several more times with distilled water. Rubber gasket looked worn so I changed the thermostat and new gasket, sealed that, filled with coolant. I tried burping again just like before, but now the upper radiator hose doesn't get hot like it did during the 3 hour flush, like it's not cycling coolant and in 10 mins running, the temp starts rising. I'd really appreicate any input!

[@motorcarnut]

You definitely have air trapped in the system , try loosening the clamp on the upper radiator hose until coolant comes out but be careful not to burn yourself. Air is trapped in the system. Sometimes letting the engine cool down it will suck in more coolant and self bleed itself.

[@VicesN2Virtues]

This is a year old video and you just responded within 30 minutes? Holy cow man. I am so very grateful! I'm letting it cool again now and I will certainly try that. After the first time I let it cool, I fired it back up, it didn't bubble really but it continued to steadily push a bunch of coolant up out of the radiator. So I came in and watched your video! I really appreciate you sir. You're definitely getting a sub!

[@motorcarnut]

@ActualizedOutlaw thank you as well really appreciate the feedback as well.

[@johnverdin6600]

I have a 2006 volvo xc90 what could be the problem with it running hot only when it fills like it it has new water pump new radiator new thermostat and new thermostat sensor I can let it Idle it the drive way for over 30 minutes and it doesn't run hot then all of a sudden it starts to run hot and I don't have any Coolet links anywhere and the coolet level is always at the normal range and the fan kicks on ????????????

[@motorcarnut]

Bad or going bad head gasket would be my guess.

[@johnverdin6600]

I don't never have to add Coolet

[@johnverdin6600]

and my oil never has coolet in it are it doesn't look like a milk shake

[@motorcarnut]

It can be leaking into the combustion chamber ( cylinder )

[@motorcarnut]

Just replied.

[@johnstaten5287]

Super thanks

[@motorcarnut]

Thank you too!

[@favoredbygod0771]

I have a 2011 Infiniti QX56 I have fluids leaking from the front of the truck. I’ve changed the coolant reservoir,water pump, radiator still leaking and now overheating . I need help

[@motorcarnut]

Got to clean everything dry then start up vehicle and see where leak is coming from. I’m not there so can’t help more than this

[@favoredbygod0771]

@@motorcarnut Thanks

[@motorcarnut]

@favoredbygod0771 no problem

[@Angeli.]

Thanks again 🙏 great video

[@motorcarnut]

Thank you! Appreciate the feedback!

[@gasisthepastendoil]

Thanks

[@motorcarnut]

No problem!

[@teelajackson9991]

I changed my thermostat and water pump but it's still overheating somebody tell me what's wrong

[@motorcarnut]

If you followed my video then could be the radiator cap or radiator itself or a blown head gasket

[@WhoDibbles]

Radiator cap trust bro trust could have the wrong one on and could be pushing air in your system

[@jameswheeler6954]

@@WhoDibbles sounds like I have the same problem, bought new radiator cap and weird problems overheating ect …. Thanks for the info 👍!

[@lesibamdlalose3678]

Head gasket+ cap + radiator+ radiator hose+ thermostat+ water pump. Still overheating

[@motorcarnut]

Cracked cylinder head or block

[@tamir4483]

new pump new termostat new coolent fans working no air still overheating i tried for a while to drive without a termostat and didnt Overheat without (i tried a few termostat all did the same)

[@motorcarnut]

Did you replace the radiator cap? Also could be a bad head gasket. Try this. With engine overnight cold squeeze top radiator hose to feel how hard it is, then start vehicle and in about 5 minutes squeeze it again, should be about the same hardness, if not air is pumping up coolant system because of a blown head gasket.

[@Josh45263]

@@motorcarnutso if after 5 min it feels harder then before it’s the head gasket?

[@motorcarnut]

It does sound like it yes

[@stefcurry6195]

I changed my thermostats on my car and now it’s not holding coolant but I’m not seeing a leak…help!

[@motorcarnut]

Recheck your work if there wasn’t a leak before?

[@KayCutta225]

Thanks

[@motorcarnut]

No problem