Automotive Air Conditioning Information Forum

After having had rear ac for years in various vehicles, they do not cool well at idle as the compressor simply does not have enough BTU capacity at idle. You need to check your pressures at 2,000 rpm. I run the rear blower fan on low speed even when nobody is in the rear of the vehicle. If you are ...

Working on a Grand National ac system which has been modified. Owner wants the system to work at peek performance especially at idle. Not positive what refrigerant is in there now but it is one of the r-12 alternatives I was told, also the mineral oil was not changed. Currently it can put 40 ...

"Owner wants the system to work at peek performance especially at idle."
This is an impossible task. At idle the comp is doing nearly 0 work.


I would not say that it is an impossible task. The compressor is only doing nearly zero work if you are running a Sanden. GM V7 would be my choice as ...

I forgot to post the resolution to this problem. The 2012 van had a Denso 10S17F put on it from the GM dealer rather than the 10S20F a dual ac van or ambulence package calls for. Probably a combination of a slightly weak compressor or adding 30cc of compressor displacement, either way it made all ...

The ac system removes heat from the cabin via the evaporator and rejects heat to the exterior via the condenser. If you mount the condenser inside the vehicle your system will actually have a net increase in heat in the interior of the vehicle.

If the ac system is not operating because of vehicle ...

Nissan/Infiniti have also used variable compressors with H-block style TXVs for over a decade now.

The concept is not different that what GM did with the STV /POA valve and Chrysler did with the EPR mounted on the old 2 cylinder V-twin steam engine under their hood. Either way the suction pressure ...

I do not know where the myth came from but it certainly is complete and total mis-information that a variable displacement compressor will not work with a TXV. My guess is that some of the aftermarket air conditioning companies claim it will not work to sell more compressors and mounting brackets ...

The condenser certainly cannot be inside the vehicle. You can mount it remotely though. A lot of van based buses as well as limos have a condenser for the rear system either underfloor or mounted in the skirt with electric fans. I have even seen 2 condensers run off the factory compressor on many of ...

GMs midsize FWD cars like the Achieva, Skylark, Lumina, GrandAm and the like in the mid 90s used an externally equalized expansion valve with the V5 just like your Trooper. I rebuilt the system on my grandmothers 1995 Achieva 3.1L V6 around 2005 and that system would freeze you out in Texas heat. I ...

My experience with that compressor was not great. It is noisy because of the gears inside of it and it lacked displacement and BTU capacity compared to a GM compressor.