A/C not cooling

JACK LANCE

MEMBER
1997 LINCOLN TOWN CAR
4.6L
V8
2WD
AUTOMATIC
115,000 MILES

A/C not cooling. I did jump relay and A/C system came on. There is no power at pin 30 at the relay to turn the A/C clutch on. I jumped the A/C clutch cycling pressure switch by unplugging the switch and shorted the wires together, but that did nothing. It seems like a fuse, but I cannot find a blown fuse. Do you know which fuses should be checked. No twelve volts at A/C cutout relay.

7 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Good afternoon.

The power for pin 30 comes from the high side pressure switch. You need to verify voltage at the high side pressure switch.

Roy

Image (Click to make bigger)

Was this

answer

helpful?

Yes

Wednesday, May 16th, 2018 AT 9:24 AM

JACK LANCE

MEMBER
4 POSTS

Thanks for the information. My Haynes manual did not have that diagram. I did find the high pressure switch, but had no power there or at the low pressure switch or pin 30. Any guidance would be helpful.

SPONSORED LINKS

Was this

answer

helpful?

Yes

Thursday, May 17th, 2018 AT 6:48 AM

ASEMASTER6371

MECHANIC
52,797 POSTS

It is fed from the control head to the clutch cycling switch and then to the high side pressure switch.

Diagram attached.

Roy

Image (Click to make bigger)

Was this

answer

helpful?

Yes

-1

Thursday, May 17th, 2018 AT 6:57 AM

JACK LANCE

MEMBER
4 POSTS

Thank you for your help. I have fixed the control head. http://www.lincolnsonline.com/tech/00261.html. At this website I soldered the exact pin on the circuit board they show in the picture, which is a pin of a relay on that board. Very easy. reassembled and the A/C began working again. It has been working fine for several days now. Very interesting and simple fix.

Was this

answer

helpful?

Yes

Wednesday, May 30th, 2018 AT 8:19 AM

ASEMASTER6371