I had an AC problem diagnosed by a professional firm and they determined my compressor is bad. Long story short.... I replaced the compressor, accumulator, and both front and rear expansion valves (2001 Montanna with front and rear air). I pumped vacuum for an hour, then filled with 2 lbs of R134a freon (spec is for 2.2 lbs.) Low side pressure at idle is 50 psi..... at 2000 rpm will drop to 40-45 psi. But high side stays constant around 200-250 psi. And air is only moderately cool coming out of vents.
Is it possible I purchased a bad compressor? It was a reman. I don't know what else it could be. I feel I have replaced everything that is reasonable.
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Re: AC problem with 2001 Montana passenger van
Did you replace the expansion valve?
Also try adding just a little more freon and see if that makes a difference....is there a sight glass you can view with the system activated to be sure you have it completely air free?
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the ac compressor is controlled by the thermostat connected to the evaporator under the dash When the cab air temperature reaches the set temperature the ac compressor switches off . IT is called cycling. If it causing a problem with the engine rpms then there is a sensor problem not an ac problem so run the fault codes to determine where it is . ECM's are programmed to maintain constant rpm regardless of the load placed on the engine at idle.
In early model cars . There was a firm called smiths that made under dash ac units for big American cars and one unit generally froze the back seat passengers . So yes if you get a good unit professionally fitted
Why was the compressor diagnosed bad?Did it send anything into the system that may have blocked a line?Did you flush the complete system?
I would have started the compressor by jumping the low side switch to make sure it could pull a good vacuum before adding any 134a.
You may have a blocked system with debris/grindings from the old compressor?
The replacement expansion tubes may be blocked now,were the old ones clean?
Make sure you have good air flow through the condenser when refilling the system.
Does the new compressor sound like it's working correctly?
I still want to see it pull a good vacuum first.
There are two blend doors with actuators in models with separate controls for driver and passenger in the HVAC unit. Apparently the driver's blend door is broken/jammed, or the actuator is not working. You'd need to check a service manual to determine how hard it is to get to and repair the driver's blend door.
Without your actual trouble code, I am assuming that you are have a misfire on cylinder # 5. The computer cannot really tell what is causing the misfire only that cyl 5 is not putting out full power. If it misfires when cold then smooths out as it warms up, I would say it is probably an injector that is sticky, as it warms up it starts working properly.
Bad News. I recently had the same type of smell ( no leaks or puddles either) coming from my van and had to have the intake manifold gasket replaced due to the Dex-cool issue. It appears GM installed an inadequate/substandard gasket when they built the van. My van only had 65,000 miles on it. There's a Dex-cool settlement you could have applied for but repairs had to be made by May of 2008.
This is the only real complaint I've had with the van.