1999 hdtop a/c problem
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Joined: Apr 2007
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From: SHREVEPORT LOUISIANA
1999 hdtop a/c problem
A/c slowly got warmer. In past was very cold.
Had system recharged, it cooled for a while but never cold then got hot indicative of perhaps a leak in the system.
Could i try a leak stopper additive, recharge system again or is there a common problem with a 10yr old c-5 a/c system i need to know about? Help!
Had system recharged, it cooled for a while but never cold then got hot indicative of perhaps a leak in the system.
Could i try a leak stopper additive, recharge system again or is there a common problem with a 10yr old c-5 a/c system i need to know about? Help!
Melting Slicks
Joined: May 2006
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From: The Corner of Moncks
St. Jude Donor '07
I've read a rash of posts lately about '99 a/c problems, must be an epidemic, I also was a victim, I had my compressor replaced last week, 10 years old, 152,000 miles, leak check revealed it was the compressor shaft seal, a friend of a friend did the work in his shop, $750.00 later, I'm cool again, money well spent IMO. 
Team Owner
Joined: May 2001
Posts: 36,836
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From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
I've read a rash of posts lately about '99 a/c problems, must be an epidemic, I also was a victim, I had my compressor replaced last week, 10 years old, 152,000 miles, leak check revealed it was the compressor shaft seal, a friend of a friend did the work in his shop, $750.00 later, I'm cool again, money well spent IMO.
Btw, I have 157K on mine on the original refrigerant. It's not quite as cold as it once was, but still cold nonetheless. I plan to add about 1/4 to 1/2 can or so this summer.
Burning Brakes
Joined: Nov 2002
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From: Los Altos CA
Team Owner
Joined: May 2001
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From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
I agree with you about the leak stop, but isn't a "TXV" the old term for "suction throttling valve"? Our C5s (and many many other vehicles) use a CCOT (Cycling Clutch Orifice Tube) system.
Drifting
Joined: Dec 2006
Posts: 1,523
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From: Holly, Michigan
What I referred to as TXV is the thermal expansion valve...Sometimes is a fixed orifice, or an active throttling valve...Not familiar with the newer technologies. My premise is that the orifice can be clogged/gummed up...When I worked at Chrysler (near the HVAC testing lab), I was told by the test engineer (30+ years experience) that such additives are a bad idea.
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Team Owner
Joined: May 2001
Posts: 36,836
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From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
What I referred to as TXV is the thermal expansion valve...Sometimes is a fixed orifice, or an active throttling valve...Not familiar with the newer technologies. My premise is that the orifice can be clogged/gummed up...When I worked at Chrysler (near the HVAC testing lab), I was told by the test engineer (30+ years experience) that such additives are a bad idea.
The CCOT setup is a simple, inexpensive, and pretty effective design that GM went over to some number of years ago. Easy to service too. It does however still incorporate a screen (designed primarily to keep metal particles/dirt, etc out of the compressor and the system) but the screen's capacity is very limited and it can still be clogged.
