Question about 1996 Lincoln Town Car

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WOT cutout relay, always on, A/C compressor wont engage

A/C inop.
T/Sing found WOT cutout relay always on. Cuts power to compressor clutch. Seems to be controlled by PCM. All else seems to be OK. It's a '97 town car with low miles.

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  • gjoypharris Jun 29, 2009

    Been done, no help! The relay is controlled by the PCM and it is enabled all the time which I think means that there is a problem in the PCM. As I said earlier it is only enabled if the PCM sees a wide open throttle, when it is working right. Of course there could be a short in the wiring.

  • gjoypharris Jun 30, 2009

    Sir,
    I don't think you read the problem correctly or you wouldn't have said replace relay. Remember the relay is enabled, there fore the coil is good. But I did try a new relay before I posted. Sorry I upset you. I know you get 'em all right!



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  • Lincoln Master
  • 75,797 Answers

Replace th relay, this is a common problem

Posted on Jun 29, 2009

  • yadayada
    yadayada Jun 29, 2009

    want any more help? then don't give out these crapolla ratings,

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AC fuse and relay for 2001 Ford Expedition


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Pressure transducer switching incorporates the functions of the high-pressure and the low-pressure cutout switches along with the fan cycling switch. The pressure transducer is located in the high-side liquid refrigerant line behind the right strut tower, between the right strut tower and the front of dash. The output from this pressure transducer goes to the electronic control module (ECM), which controls the compressor function based on the pressure signal.
HVAC Compressor Clutch Does Not Engage

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Did you perform the Diagnostic System Check - Vehicle?
Go to Step 2
Go to Diagnostic System Check - Vehicle

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  1. Start the engine.
  2. Turn the blower switch to any position except OFF.
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Go to Testing for Intermittent Conditions and Poor Connections
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  1. Connect a scan tool.
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Wiring diagram


are the A/C fuses good? what transmission, auto or stick?
the first check is , does the compressor, cultch, engage
and spin the actual compressor main shaft at full speed.
yes, then loop is bad. (freon loop) (fan good)
No, then below is wrong. (electrical)
94/metro/swift
did you check pressures yet?
if not , then the hi/low limit switch may be open killing the compressor
so it dont self destruct, never bypass this limit switch.
the High low switch if open kills DC power to the A/C main relay. coil.
coil yellow wire must be at 12vdc or the loop has wrong pressures.!
dig,. it refuses to destroy its self. so kills the relay.

all posts, USA.
does the A/C lamp on dash turn on? if not the blower is dead.!
on the 94,(i dont have 93 drawings)
you can get better drawings for 94 at alldata.com, any time.
yellow wire is hot. (clutch dead)


the next point of failure is the car has throttle pedal switch
that is closed all time but wot, wide open throttle cuts AC.
so this switch can fail and cut A/c (USE A VOLTMETER) opens.
the clutch has its own relay, that is controlled by
the A/C amp module (better name A/C logic module)
it cuts A/C for many reasons.
we use a voltmeter at the AMP mod..

inputs that can stop A/C compressor, are:
1: engine overheat sensor bad. 0v , goes to 12v at 235F engine temp.
pin 9.
2: pin11, not 12v means dash lamp out
3: pin 5, transmission cut, or throttle pedal cut out (WOT).
4: pin 4 and 10 , evap core iced up cut, thermister sensor.
5: pin 8, lost 12vdc power.

The TCM cut out , to pin 5 is just for automatic trans, with TCM shifter electronics, it sends cut when the trans detects overload.
(hills? or tranny goes to limphome mode, {sick})
see amp below.
that is it, for electrics. answer my first questions for better answers.


629993be-93ca-4f20-9be8-afaaef186582.jpg

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