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View Full Version : 1997 Lincoln Continental A/C System Multi-function Relay


bufree2004
September 5th, 2014, 03:31 PM
My 97 Continental has a bad Multi-function Controller (Part No 12B577). Problem is we can't find it. The Mitchel Diagrams show it on the brace above the Radiator but the actual device is a controller for the Air Ride System. The Ford Diagram shows it mounted on the twin Engine Cooling Fan Assembly between the Fans...not there either and I have had two mechanics look for it. Where is it or is there something that was changed mid production. Jan 1997 was build date.

Dereck
September 5th, 2014, 04:01 PM
Hi Bufree2004

Welcome dude :cheer:

I can't find a CCRM (Constant Control Relay Module) also called an IRCM listed for a 97 Continental A/C system on the wiring diagrams, what is actually wrong with your A/C system? Do you mean Blower Speed Controller?

Regards

Dereck

bufree2004
September 14th, 2014, 03:39 PM
It shows up in both dealership information and diagrams and Mitchell diagrams as being either on the cross brace above the radiator or on the fan housing just below it. I have the diagrams from the Ford dealership. I have working relays in the fuse box but no power to the clutch. It is on the parts lists. See attachment item 54 not to be confused with item 55. What actually resides in this location is a ride level controller. Which is not listed. It is very strange as everybody knoows what is is we just can't locate it?

Dereck
September 14th, 2014, 04:07 PM
Hi Bufree2004

Ah you want the A/C compressor clutch relay, that relay you are indicating in your diagram is for the Air Suspension, the A/C clutch relay is in the power distribution box.

Regards

Dereck

Desert Stallion
September 15th, 2014, 04:45 AM
Dumb question, someone measured the freon in this thing to make sure it actually should be engaging the compressor clutch right? I've tried chasing down electrical gremlins before that turned out to be a mechanical issue, lol.

If you want to do this without the car running, you can pull the plug to the pressure switch and with the key in the 'ON' position and the a/c turned on from inside, jump that connector with a piece of wire.

At this point, you're effectively isolating the electrical circuit for the compressor clutch and removing most any other variable that may cause the clutch to not engage. Really about the only thing left that's not directly electrical for the compressor is the WOT relay, if this car even has one. That may be controlled by the computer on this car via the TPS, I'm not sure to be honest.

Anywho, if you jump the pressure switch connector and the clutch engages, then most likely you are either low on freon, or have a restriction somewhere causing the freon pressure to spike, or the pressure sensor itself has crapped out, which does happen from time to time.

If you bypass the pressure switch and the compressor clutch does NOT engage, then yeah the compressor clutch relay is most likely the culprit. Clear as mud right? lol

Good luck and let us know what you find!