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AC CLUTCH VERY FREQUENT ON AND OFF

Tiny
ABANS
  • MEMBER
  • 2003 LINCOLN TOWN CAR
Air Conditioning problem V8 Two Wheel Drive Automatic 87000 miles

Therefore, its not cooling. Checked and found the there is sufficient Freon and the pressure looks okay. The main cooling fan is running normal even when the ac clutch on.
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Saturday, May 1st, 2010 AT 4:44 PM

8 Replies

Tiny
PATUSA
  • MEMBER
  • 6 POSTS
Dear all experience people,

I have 2003 Lincoln Town Car, it's been good with me since I had it brand new but last month the AC had problem and I already try the best to fix it but the compressor is still not engaging, if I connect directly pin 1 and pin 5 of the relay then the compressor was engaging and AC cold but I can't stop the compressor until turn off the engine. I did drove 2 hours in the weather 100F in California to get home. I parked and open the hood OMG the AC line was frozen and cover by the ice so I have took out the wire then the compressor stop working.
Here is all step I did try:

1. Replace 2 switch (low and high pressure)
2. Replace AC relay 204
3. Replace AC temperature sensor (at the firewall near by the last spark plug on bank 1)
4. Full re-charged Freon
5. Replace the climate control
6. Replacement the heater actuator blend door
7. Replacement the panel/defrost actuator blend door
Any body experience with that issue. Please, help me out. Thanks all
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Wednesday, September 13th, 2017 AT 11:59 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
With the engine off can you turn the compressor clutch by hand?

Please let us know what you find.

Cheers, Ken
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Wednesday, September 13th, 2017 AT 11:59 AM
Tiny
PATUSA
  • MEMBER
  • 6 POSTS
Yes, I can turn it by hand.
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Wednesday, September 13th, 2017 AT 11:59 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
It sounds like you have a climate control module that is out but to be sure lets do some testing. Use this guide and follow these wiring diagrams to see where you loose power at.

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

Please let us know what you find.

Cheers, Ken
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Wednesday, September 13th, 2017 AT 11:59 AM
Tiny
PATUSA
  • MEMBER
  • 6 POSTS
Thanks Ken.
Unfortunately, there is no power on the compressor's connector other connector as High and low pressure switch has power.
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Wednesday, September 13th, 2017 AT 11:59 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
It sounds like the AC compressor clutch relay is not working. Here is its location (below) and a guide so you can check it out.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Please let us know what happens so it will help others.

Cheers, Ken
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Wednesday, September 13th, 2017 AT 11:59 AM
Tiny
PATUSA
  • MEMBER
  • 6 POSTS
Dear Ken,
Thanks for your replying but on my first post the 2nd step is replacement the new relay 204. Do you have or any body have the climate control diagram to test, My climate control wires doesn't have PK/BL wires, so I don't know what pin number that will send the signal to the compressor. Please help.
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Wednesday, September 13th, 2017 AT 11:59 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
In the third wiring diagram it shows a gray and white wire powering the A/C compressor clutch
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Wednesday, September 13th, 2017 AT 11:59 AM

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