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post #1 of 8 (permalink) Old 05-30-09, 05:37 PM Thread Starter
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No power on a/c compressor.

I am working on a '99 Ford Escort. The a/c does not come on and while checking, I found that cooling fan was out, which burned the fuse. After changing the fan, I still don't get cold air. I checked the low pressure switch, which is ok.

Later on I found that the two wires that connects the a/c compressor don't get any juice. Looking in the Haynes manual, I cannot the compressor.

My question: Does anyone know where the blue/white wire and red wire comes from? That way I can check from there.

Thanks!!

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post #2 of 8 (permalink) Old 05-31-09, 03:52 PM
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Re: No power on a/c compressor.

Quote:
Originally Posted by alwaysdutch View Post
I am working on a '99 Ford Escort. The a/c does not come on and while checking, I found that cooling fan was out, which burned the fuse. After changing the fan, I still don't get cold air. I checked the low pressure switch, which is ok.

Later on I found that the two wires that connects the a/c compressor don't get any juice. Looking in the Haynes manual, I cannot the compressor.

My question: Does anyone know where the blue/white wire and red wire comes from? That way I can check from there.

Thanks!!


Hello and good day:


You may have a lost in Refrigerant in the cooling lines. You said you that the Connection to the A/C compressor is missing wires??

Those wires usually got to the Master Fuse Box, then to the PCM.

Good Luck and good repairing Sterling_6
"You know, just like in that Book, When Jesus beats up Moses to get Religion!!"
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post #3 of 8 (permalink) Old 05-31-09, 08:28 PM Thread Starter
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Re: No power on a/c compressor.

Actually, the connector of the compressor has two wires; blue/white and red. I am just wondering where those wires coming from as the following parts have been tested and are correct:

- 40A fuse
- Cooling fan (was burned up but has been replaced)
- Low compressor switch (Tested with a jumper)
- High compressor switch (Tested with a jumper)

The two wires on the compressor do not getting any juice. By testing the compressor on the battery, what is considered the hot and ground on the compressor - Blue/white or red?

Thanks
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post #4 of 8 (permalink) Old 05-31-09, 08:36 PM
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Re: No power on a/c compressor.

Have you checked the refrigerant pressure? You may be low, not allowing the pressure switch to kick in the compressor.

I'll try to find the info you are seeking.
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post #5 of 8 (permalink) Old 05-31-09, 09:21 PM Thread Starter
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Re: No power on a/c compressor.

I tried to add freon but for some I can't add since the compressor doesn't kick on...
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post #6 of 8 (permalink) Old 06-10-09, 06:30 AM
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Re: No power on a/c compressor.

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Originally Posted by alwaysdutch View Post
I tried to add freon but for some I can't add since the compressor doesn't kick on...
You wouldn't want to add freon unless you know that's your problem or you could damage the compressor. The problem is probably the A/C relay insde the CCRM. I've sent you a PM giving you details.
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post #7 of 8 (permalink) Old 05-31-10, 05:05 PM
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Re: No power on a/c compressor.

i have a 95 escort and was having trouble getting the AC to work also. the fans worked, air would blow but it would never get cool. and also because of this is had no defroster. i replaced a relay that looked burned out and it worked for a while then did it again. we replaced it again and nothing. we took it to the shop and they said it was a relay that was further under the hood by the wheel well (if i remember correctly). they said they don't make them anymore so they fashioned one and now it works fine. i don't know much about cars but i hope my experience helps out.
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post #8 of 8 (permalink) Old 06-13-10, 10:48 PM
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Re: No power on a/c compressor.

Hello I have a similar problem I have a 1994 Ford Ranger XLT 4cly. There is no power getting to the compressor. I have tested both limit switches. All fuses and switch on the inside control. I jumped the compressor from the battery and the compressor ran and blew cold air. Why would there be no power going to the main lead on the compressor? Also when you press the power button to turn it on the engine speeds up as it would if the compressor would kick on but is not engaged. Any solutions? Thanks
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