Question about GMC Cars & Trucks
My dad has a 1993 GMC 6.5L Diesel. The air did work on it, but when it stopped blowing cold he put more freon in it. He needs to know how much pressure it is suppose to have. I have researched and I have had no luck at finding the answer. Does anyone know? Please and thank you!
Generally speaking, with outside air temp around 80 degrees, and the engine at idle, low pressure should be around 35psi and high pressure should be around 200-250psi.
R134 freon will run a little lower or higher than R12.
Posted on Jul 11, 2013
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Posted on Jan 02, 2017
SOURCE: MY AC IS NOT BLOWING COLD
not happy here i bought a machine for recharging A/C and now they have started selling the gas in a can in the supermarkets ,2400€ for a machine and you can buy a can for about 25€ .could have a blocked restrictor valve ,venturi valve by whatever name you call it but its in the actual pipe on american cars and on the new ones here now as well,only need a bit of dirt to move in the system and it will block this valve evan if someone has put a leak sealer in this could cause the valve to clag up and not allow the gas through.strip and clean whole system blowing it out with an airline.This gas has to be recovered with a machine and released into the atmosphere.
Posted on Feb 01, 2009
The A/C system has a pressure switch will keep the A/C from running if the freon is low. It prevents damage to the A/C compressor from low freon.
My bet is you'll need to recharge the A/C system.
Posted on Apr 14, 2009
Hello I'm a M.B. tech. 1st you need to know why the freon is low. Hopefully it just needs to be serviced. There is a component located in the lf of the engine compartment called a receiver drier. It soaks up the moisture in the freon so the gases can work the way they are supposed to. On this unit there should be 2 switches(I believe they were combined into one switch in 98. 1 switch is a temp switch that operates your electric fans, the other is a compressor cutoff switch. Assuming the compressor is not coming on-take a fused wire and bridge the 2 contacts- If the compressor does not come on at all there is another problem(it is not low on freon. On the condenser there is a high side port(it is the bigger of the 2)By the brake master Cyl.(lf of the engine compartment thereshould be a smaller low side valve in line with the fuel cooler hose. Usually you can hook up a machine to the low port and **** freon in through that port. Assuming you do not have a refrigerant machine. It is very self explanatory on the bottle of r 134a refrigerant which can be purchased at your local auto supply store. I would start with 1 lbs. and add dye with the freon in case there is a big leak. If the system is overcharged it will not cool properly. I believe the system capacity is approx. 2 lbs. Add a few ounces after the first pound until a/c system is cooling properly and the electric fans are also coming on when the system gets to high. If you get a can with a good Gage set on it you should see the high side between 150 and 2000 psi(fan coming on at max. press.) also the low side should read about 35. It is about the temp of the evaporator which is i=located in the dash and the blower blows through this component out through the vents. Hopefully I have been helpful.
Posted on May 28, 2009
There is a recall that has something to do with the air/heat system in 2005 Dodge Grand caravans. Recall F01. Here is a link. I had mine done two weeks ago, cost me nothing. My air conditioner was overheating.
Posted on Sep 10, 2009
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