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JasonT
Anonymous Poster
jteeguarden@msn.com
Apr 29, 2009, 11:25 PM
Post #1 of 3
(1155 views)
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A/C and door latch
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1988 GMC 1/2 ton p/u, 4x4, K-1500, 183,000 miles. Thank you for your previous help. I have two issues I need help with.
1. A/C: The air conditioning is not blowing cold air. I am assuming the refrigerant needs to be recharged. I see the hoses, fittings and etc. I also see some "t"s with caps that screw on and off. Are special tools needed to recharge the system or do I simply need the can of refrigerant and the hose/valve assembly that connects to the can and the other end to one of the t's to allow the refrigerant to flow into the system. And if it is that easy what precautions must I take during this process? My system was converted quite some time ago to the new type of refrigerant; I do not recall what it is but the label is under the hood.
2. Door latch: my key will not open the driver's side door any longer. I have to get in from the other side and open the door locks. I thought the key was worn out or the lock cylinder had worn out but I had a locksmith take it apart and look at it. He said the key is turning the cylinder ok but the rods are not being turned by the latch mechanism. He said a new latch is required and also that it was a very expensive part; around $350.00. Does it sound like he has diagnosed this correctly? If so, I can probably get the part from my auto wrecking place for cheap. My question is then, how difficult is it to change out the latch? These are power windows and door locks; they work fine, it is not being able to get in from the driver's side that is the pain in the horse's rear end. Thank you, Jason.
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JasonT
Anonymous Poster
jteeguarden@msn.com
Apr 29, 2009, 11:40 PM
Post #2 of 3
(1152 views)
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Re: A/C and door latch
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I forgot: 350 engine, 5.7 liter
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Loren Champlain Sr
Veteran
/ Moderator
Apr 30, 2009, 4:48 PM
Post #3 of 3
(1146 views)
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Re: A/C and door latch
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Jason; Your system originally had R12. If it's been converted to R134, that's great. However, if it's low on refrigerent, there is a leak, somewhere. The leak needs to be found and repaired before wasting any R134. You may want to check to see if the compressor is engaging when A/C or DEF mode is commanded. Pretty sure you have a pressure switch in the A/C system that will keep the compressor from engaging if it's low on refrigerant.
This switch can be by-passed for diagnosis only. Pressure guages will then be needed for diagnostics. There is around 200 lbs. pressure on the high side, so extreme caution will need to be taken. Trying to introduce a can of freon into the high side can be a day ruining experience if the can blows up in your hand.  A/C repairs are generally left to a professional.
Loren
SW Washington
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