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A/C problem. No cold air

U

unnamed882002

CEG'er
Joined
May 4, 2010
Messages
34
my A/C won't blow cold air,but heater works.
the cooling fan on the radiator won't run, it ran previously when the A/C work.
any help ?
 
Sounds like compressor took a dump, check your ac relays in the engine bay. Or it could be as easy as a recharge. Before you rule it on comp take it in to tire kingdome and have it recharged they can preasure test it there to check for line leaks..
 
I don't know on a contour where they are located but try swapping them around and see what happens look for one that is the same size?? Also test for power going to your compressor
 
i checked, it doesnt have the small size relay to switch with the AC relay ....
any other way to test the relay?
 
today i try to fill up the r134a stop leak.
finally the fans run, but the clutch engage for 1 second and disengage for 5 second, this cycle keep repeating...
when the clutch engage, the pressure at the low side drop, when disengage, the pressure raise...
what is the problem?
 
i have a pressure around 50PSI when the cluctch is not engage, when the clutch engage, it drop to 20 psi
so should i keep charging?
i just scare that i overcharge and damage the system
 
I have same issue. The clutch wouldn't cycle, but after I loaded R134a it would start cycling and hit similar numbers as above. 45-50 high pressure and around 20 low. Seems all would be working but still not blowing cold.
 
today i charge another can, 10oz....
it become better....53F at the vent.
but i think it still under charge, when the clutch engage, the pressure drop slowly..... until it reach 20psi.
then disengage again,the cycling is around more then 20 second engage, 2 second disengage.

might need another can >.<
 
I actually put more in as well. The pressure reading never really changed at the low port, roughly around 45PSI, but the temperature started dropping at the vent. I killed a 12oz can, now I don't know how much more I need. I know at the start the clutch wouldn't engage so should I assume it was empty and that it can take much more based on the system capacity? Once I hit capacity should the pressure start increasing again? In short, how do I know when I have the right amount in the system? :)
 
ok, both of you need to stop what you are doing right now as based on what you haven't said neither of you know how to work on the AC system correctly.

first if the R-134A was low you have a leak. have either of you identified where the leak is from? If you have has it been repaired?

are you using the proper guage sets to check the system? Have you referenced the tables/charts that specify how much R-134A is required? Have you check the cycle time chart to see what your system is doing?

Have you brought the system to a vacuum before filling? have you verified that the system will hold a vacuum?

You can not just keep adding cans of R134A. You can have to much in the system and it will negatively effect the performance.

Also the clutch is suppose to cycle until the ambient temp is well above 90 degrees.
 
projectSHO89 said:
That's the low side pressure when the clutch is engaged.

Brapple is right, you're over your head.
Click to expand...

Brapple probably is right and I plan on taking it in even though it is operating fine now. I was questioning why you said the PSI should be around 80 PSI, because I thought we were all taking measurements at the low-side port with clutch engaged.
 
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