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Won't cycle back on

mhfd112 on Thu July 10, 2008 11:30 AM User is offline

Year: 1999
Make: Ford
Model: F350
Engine Size: 7.3
Refrigerant Type: R134a
Ambient Temp: 80
Pressure Low: 26
Pressure High: 150
Country of Origin: United States

I was checking this system out this morning. It was 8.5 ounces over charged. I vacuumed and recharged to factory spec. Got down to 39 degrees and cycled off and then it wouldn't cycle back on. Should I be looking for a defective switch? Low pressure switch has been replaced recently.



mhfd112 on Thu July 10, 2008 11:38 AM User is offline

Could the problem be the clutch gap? I tapped around on it with the truck turned off. Started it up and compressor ran.

Chick on Thu July 10, 2008 12:21 PM User is offlineView users profile

check the gap, when it shuts off and don't come on, tap "inwards" on the front plate, if it grabs, then the gap is suspect..should be around .02 Cycling swicth can also cause this, but most common is the clutch gap..Hope this helps..

Email: Chick


Freedoms just another word for nothing left to lose

mhfd112 on Thu July 10, 2008 2:33 PM User is offline

The gap on this one was .054.

Can shims be added without discharging the system?

I know this has been covered many times before so I will go do some searching.

mk378 on Thu July 10, 2008 2:37 PM User is offline

Yes, you can take the clutch apart with the compressor still installed and the system charged.

mhfd112 on Thu July 10, 2008 9:03 PM User is offline

How do we go about adding shims? I did a search on the forum and didn't find what I was looking for. Also, where do we get shims. The parts stores and one local ford dealer haven't been any help so far.

Spector on Thu July 10, 2008 9:11 PM User is offline

Actually with a .054 gap you will need to remove shims.
Remove the center bolt in the end of the clutch hub then pull the hub off the shims are between it and the shaft.

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