Air Conditioning Compressor Clutch Not Getting Power (electrical issue)

Tiny
CLINTC
  • MEMBER
  • 1999 FORD WINDSTAR
  • 3.8L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 275,000 MILES
Ok.
Here it goes! No power to AC Compressor Clutch. Here are the details:
1) Unit DOES have freon
2) There IS power up to relay for clutch (#204) that is in the PCM (fuse box under hood) when using a test light
3) Cooling fans DO kick on
4) When AC switch is turned on (in car) the RPM does change and switch looks to be working fine
5) AC comp went out at once (no intermittent issues)
6) No power to low pressure cut off
After researching this I'm thinking it could be the relay in the CCRM (constant control module)? Although I can't find a good enough diagram to find it! Everything looks like it's on firewall by driver but I can not find this little guy!
Please help with what you can. Van has 275,000 miles on it so I can't dump money in it and I can't afford a $90 electrical diagnostic from the specialist. Please advise- I am fairly good with some basic mechanics. I have tried to figure this out and the open circuit with no luck. Now it's a challenge!
Thanks again, Clint

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Friday, May 16th, 2014 AT 6:34 PM

5 Replies

Tiny
MHPAUTOS
  • EXPERT
Hello,

We need power at he low pressure switch. Here is a guide and the wiring diagrams for the air conditioner system so we can see how it works. Check fuse 10 - 10 amp for power that is what feeds the low pressure switch and see where you are losing power.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Check out the diagrams (Below). Please let us know what happens.

Cheers
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Saturday, May 17th, 2014 AT 12:02 AM
Tiny
CLINTC
  • MEMBER
Thank you for your reply! I have already tried jumping the low pressure switch (2 wire switch-used paper clip) to try and force comp on. The high pressure is 4 wire do I did nothing there. I don't have gauges however a radiator shop had put one on and indicated about 3 pds in system. The ac quit several months ago during very hot conditions in AZ about 4 hrs after I added some freon. Any addition thoughts? Is there a way to bypass high pressure cut off? Thanks again for your help!
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Saturday, May 17th, 2014 AT 8:30 AM
Tiny
MHPAUTOS
  • EXPERT
To get the pressures checked, if you by pass the safety switches you can destroy the A/C if there is a problem, that is what the switches are for.

Here is a guide.

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

Let us know
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Saturday, May 17th, 2014 AT 8:35 AM
Tiny
CLINTC
  • MEMBER
Okay I finally when over everything and found the #10 fuse was melted so I cleaned the connections and replaced the fuse everything is working great! What caused the holder to melt?
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Saturday, May 17th, 2014 AT 11:26 AM
Tiny
MHPAUTOS
  • EXPERT
This is caused by a bad connections at the fuse make sure the new fuse is tight in the holder.
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Saturday, May 17th, 2014 AT 2:32 PM

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