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-   -   change ac clutch ac still wont work (https://www.f150online.com/forums/v8-engines/240582-change-ac-clutch-ac-still-wont-work.html)

matcount63 05-18-2006 06:57 PM

change ac clutch ac still wont work
 
changing the clutch was easy it only took about 20 mins its on a 4.2 well anyways the ac still wont work and also i cant get the darn horn to work ether ive got power to it and change the relay still wont work

Bluegrass 05-18-2006 08:12 PM

Did you know there is a system pressure switch. If faulty or system charge is to low it will not allow the compressor to be run for naught, plus there could be other reasons there is no power.
It is easy to test the circuit by shorting the switch plug to see if the clutch pulls in.
A voltmeter check would have indicated no power and a resistance check would have shown the clutch was good.
It become expensive to guess, after awhile.

98Lariet4x4 05-18-2006 08:29 PM

What made you think it was the clutch in the first place?

matcount63 05-18-2006 08:38 PM

theres power to the clutch
 
thats why i though it was the clutch

Quintin 05-18-2006 08:45 PM

You did put the shims that were under the flexplate on the old clutch back onto the new one, didn't you? Or did you replace just the field coil?

Bluegrass 05-18-2006 08:50 PM

A voltmeter check 'can' fool you. You could still measure voltage with a meter but thru a resistance too high to allow the clutch to pull up.

lees99f150 05-18-2006 09:17 PM

if only 1 strand of wire is connected, you will measure voltage but there isn't enough to carry a load.

projectSHO89 05-19-2006 09:11 AM

An open ground from the clutch coil will also give that symptom. Check for voltage also on the "low" side of the coil, if found, the ground is open or has excessive resistance.

Steve


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