1999 hdtop a/c problem
07-22-2009, 04:31 PM
#1
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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!
07-23-2009, 09:00 AM
#4
Melting Slicks
Member Since: May 2006
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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. 
07-23-2009, 12:12 PM
#5
Team Owner
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.
07-23-2009, 12:21 PM
#6
Burning Brakes
07-23-2009, 01:21 PM
#7
Team Owner
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.
07-23-2009, 01:39 PM
#8
Drifting
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.
07-23-2009, 05:10 PM
#9
Team Owner
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.
