Nissan Xterra expansion valve and evaporator

[@kicknsystm]

Working on my 2000 now. This is a great help, thanks.

[@chriskolar]

Thanks for watching

[@lakeview6283]

What led you to a bad expansion valve as opposed to a bad compressor? As of mid September I was running about 29 psi on the low side and 210 on the high side at 1500 RPM and air was cold. The expansion valve would sometimes squeal when I turned on the AC but that's been going on for a while. Yesterday, no cold air. The compressor engages, the suction line is slightly warm to the touch and the line to the condenser from the compressor is hot. Gages show a static pressure of about 87 psi (both low and high) at 75 degrees so I have freon. When I turn on the air, the compressor engages high side goes up slightly to about 90 psi and the low side drops to 0 or slightly negative. As soon as I turn off the system the low side quickly goes back up to match the high side. I'm thinking the TXV could be stuck open so I can't build pressure. I don't want to just change parts so I'm curious how you determined what part was bad. BTW good informative video. Thanks!

[@chriskolar]

I had the right level of r134, the bleed down or the balance after the compressor was off was long and the high side was higher than normal and the lowside was slow to drop on increades rpm. So i figured that the txv or expansion valve was not working properly or had some debris partially blocking it. If the lowside drops to 0 then there is no flow getting thru the system. Dont forget the dryer if it is damaged it will cause a blockage too.

[@lakeview6283]

@@chriskolar Thanks for the reply, it helped point me in a different direction. Looks like my symptoms are different from yours. Looking through the FSM my readings showed me I was low on freon so I decided to add a little while carefully watching the high side because I was afraid of over charging the system. Pressures started to come up and the system was cooling again and removing moisture from the air. Seems like I have a leak somewhere. Now I just need to find it.

[@jdspunkd]

It’s amazing to see how much people take out that doesn’t have to come out! 😂

[@nosurfenougheddie]

Hey Chris. Great video. What year model is in the video? I'll be doing this job soon on my 2000 Xterra. What part brand and part number for the TXV did you use? There seems to be some conflicting info on the web. Some vendors TXV show a secondary capillary tube while others do not. Confusing. Thanks again, good job!

[@chriskolar]

2001 model I think you are referring to the expansion valve. Heres the link. Four Seasons 39025 Expansion Valve www.amazon.com/dp/B001TPT4FC/ref=cm_sw_r_cp_apa_i_lWIfDbDY8N26H

[@chriskolar]

This application requires a capillary tube. The capillary tube has a temperature sensitivity that prevents the evaporator from freezing up by restricting the flow when getting too cold.

[@KevinPerez-fd9xq]

I’m about to send my 2000 Frontier to the AC shop to get my evap core , expansion valve and drier changed out. I’ll tell you it’s a good thing I saw this vid cause I believe I ordered the wrong expansion valve. I had one coming from Rockauto with like three ports to connect and I see you only have two with only that copper line taped on to the pipe

[@joshpoppe1309]

I have an 01 frontier, same everything as in your video as far as components go, if you don't mind helping, I'm at a loss here. I've got no air coming through my vents

[@chriskolar]

Gonna need more info. All fuses are good? You have power at fan? No power at fan go to resistor and check there. From there you have to work back to switch and grounds. A wiring schematic is needed.

[@joshpoppe1309]

@@chriskolar hey, thanks man. I replaced the blower, it's working at all speeds, unfortunately, the air isn't getting to the vents, i can't figure it out and i really don't want to discharge the ac of i can avoid it

[@chriskolar]

@@joshpoppe1309 when you change the flow from defrost to floor, changing modes. Do you hear the mode door actuators running?

[@joshpoppe1309]

@@chriskolar yes, it's almost like there's a blockage somewhere, either incoming or the path to the vents

[@chriskolar]

@@joshpoppe1309 you will have to check the mode doors to ensure they are operating. A boroscope is a handy tool for this.

[@leomiranda7181]

When you disconect the aluminum tubes!! The freon comes out???

[@chriskolar]

Yes the freon will come out if there is any left in there. In this case there was a leak and the freon was gone. If there is freon in the ac system take it to a shop and they can remove the freon with a special machine.

[@KevinPerez-fd9xq]

Does your ac compressor stays on constantly it does it cycle every few minutes?

[@chriskolar]

It stays on

[@KevinPerez-fd9xq]

Oh boy

[@lkz6696]

is it possible to just remove the lower half of the evaporator housing? all i want to do is clean out the debris around the evaporator, without having to disconnect the evaporator and lose all of my refrigerant. but i can't figure out if the lower half can come out on it's own...

[@chriskolar]

No you cannot split it apart without taking it out.

[@raiderman28]

What year is this?

[@chriskolar]

2001