Automotive Air Conditioning Information Forum

Vandeo wrote: Thu Jul 18, 2024 11:48 pm The engaging system on compressor is working fine (when the compressor works, an then shuts of (clutch returns in previous position))

THIS is why tbirdtbird suggested to check the AC clutch air gap !!!

I had to remove a shim from the AC clutch on my Frontier to fix it back in 2019.

I think it's the temp sensor on the the evap core which senses temps close to freezing then disengage the clutch.

Disclaimer: I'm not an AC professional.

That said, could you TEMPORARILY jump/bypass that de-icer switch that goes into the AC evaporator, to see if that "opens" too often and ...

With the plastic cap on, I don't get an indication of a leak on the default setting, but when I take the caps off, I do. All of this is with the engine cold, I charged the system a couple of days ago.

Perfect !!!! The cap is the real seal, the schraeders are not the primary seal !!!




And if ...

woody367 wrote: Sun Jul 14, 2024 12:55 pm I checked my air gap and .035 was just a little snug. I guess I should try taking a shim out?

YES

woody367 wrote: Sun Jul 14, 2024 12:55 pm If that is the issue why would the clutch engage and produce cold air but after like 15-20 minutes the clutch disengage?

Because it heats up ! That's what my 1998 Frontier did.

When I went for a drive, with an outside temperature of 99 and with the fresh air vent closed, I got the inside of the car down to about 78 which felt pretty good. The vent temperature at 40 degrees.

Vent temperature is 40F ???? I think that it's time to stop messing with the system if it doesn ...

When it gets warm I novice the clutch disengaged...

When the AC clutch is disengaged, CAREFULLY tap on the AC clutch drive plate (the center section) with a wooden broom handle or similar. See if that engages it, which might show a too-large clutch gap. I removed an AC clutch shim back in 2019 ...

Happened to me in early 1980s in our 1975 Chevy Luv truck: diminished volume of air coming out of the vents after a few hours of driving. Stopped for dinner in Parker AZ, came out and saw a big puddle as ice from the evaporator had melted. That ice had blocked the air flow.

And no electronic flaps ...

bohica2xo - I'm in Las Vegas RIGHT NOW - my oldest daughter is getting married here this afternoon! And it is really hot here, pretty much like Phoenix!

We walked from the hotel to a restaurant across Paradise last for dinner in the heat; of course, it was closed for renovations so we walked back ...

the OEM replacement compressor (Denso) apparently comes pre-filled with ND-6 mineral oil. As I understand it, this oil is compatible with R12, but not R134 refrigerant.

My question is: can I drain the oil and flush it a couple times with PAG, then fill it?

TIA for any advice - I've been unable ...

I haven't pumped down a system since 2018 when I replaced the compressor/condenser/drier on my 2004 Frontier. But I typically evacuate for about 45 minutes, while I break for lunch !!!