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What can i do to turn my compressor on. on my 1997 cadillac eldorado?

Talamant3z on Tue August 26, 2008 1:04 PM User is offlineView users profile

Year: 1997
Make: Cadillac
Model: Eldorado
Engine Size: 4.6
Refrigerant Type: 134a
Country of Origin: United States

ok i been having ac problems for a while now it just one day stop working. anyways we hooked the vacuum up to it to see if it had a leak. it does but a very small one. so since summer is already almost over thats okay, i just need the ac for a short time, and fix the leak later. anyways after we vacuumed it out the car took the first can of refrigerant quick sucked it dry. so for the second one we turned the car on so the compressor would kick in and take it, but it cut on once and turned off( after playing with it about another 100 times it cut on once again but since then it hasnt but back on). we tried everything i reset the code, pulled the battery power form the car, and bypassed the cycle switch, but it still wont cut on. i dont know what to do anymore. i was told its not the compressor (because i was going to replace it) so what is it thats not making the compressor cut on. please if you have any idea how to cut it some please post

GM Tech on Tue August 26, 2008 1:13 PM User is offline

Is there power to the compressor coil? does green wire to black wire there show 12v across the connector? If so you may have a wide air gap- tap on front of compressor clutch with a wooden hammer handle and see if clutch engages- if it does, then you need to reset the air gap on the compressor clutch

other things to check-- is there power at the a/c relay hot feed in?- does clutch engage when relay is jumpered? is there 12v across relay coil terminals?

last one I did- had a loose connection at the compressor in-line diode- 6 inches from compressor- I had to cut out the bad spot and solder in new wire.

As long as you know there are no codes in the ACM then the above is what to check..

Also, there is no cycle switch on Caddys- there is a low pressure switch by shock tower- the cycling is controlled by the thermistors in the low and high side refrigerant lines. There is also a high pressure switch in discharge pipe near the compressor- you may want to check it for continuity- it is normally closed and open upon high pressure-- or you can temporarily jumper that connector for testing.

-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

Edited: Tue August 26, 2008 at 1:19 PM by GM Tech

Talamant3z on Tue August 26, 2008 1:19 PM User is offlineView users profile

Quote
Originally posted by: GM Tech
Is there power to the compressor coil? does green wire to black wire there show 12v across the connector? If so you may have a wide air gap- tap on front of compressor clutch with a wooden hammer handle and see if clutch engages- if it does, then you need to reset the air gap on the compressor clutch



other things to check-- is there power at the a/c relay hot feed in?- does clutch engage when relay is jumpered? is there 12v across relay coil terminals?



last one I did- had a loose connection at the compressor in-line diode- 6 inches from compressor- I had to cut out the bad spot and solder in new wire.



As long as you know there are no codes in the ACM then the above is what to check..well at first when the ac went out i had the code "low refrigerant compressor off" ( but when i was going to load some refrigerant i couldnt because the gauge read 150psi) well after we vacummed it out i got one that said "service ac soon, compressor off"

GM Tech on Tue August 26, 2008 1:22 PM User is offline

And you reset those codes, right? The compressor never will come on if control head won't go into "auto" mode- and it will not do that with a/c codes set..

-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

Talamant3z on Tue August 26, 2008 1:29 PM User is offlineView users profile

Quote
Originally posted by: GM Tech
And you reset those codes, right? The compressor never will come on if control head won't go into "auto" mode- and it will not do that with a/c codes set..

yep i went into the OBD and cleared the amc? (which had the ac codes in it) but after i would clear it and turn on the car it would come right back on so thats when we tried the to bypass the cycle switch and nothing. well i let the car sit a day and cleared the code and it didnt pop up but the compressor still isnt cutting on

GM Tech on Tue August 26, 2008 1:38 PM User is offline

Does it go into "auto" mode on the climate control? If so, then check the electricals in my first response

-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

Talamant3z on Tue August 26, 2008 1:51 PM User is offlineView users profile

yeah as soon i turn the car on it does i'll check them out and hopefully that works but i think the compressor is soon to go my my orifice tube was dirty and my cousin said that the chrome flakes are the bearings was he right?


GM Tech on Tue August 26, 2008 9:41 PM User is offline

That's not bad- actually fairly typical- bearings don't flake, they wear- your compressor is not suspect based on that OT..

-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

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