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Is the pressure sensor for both the high and low pressure levels? Mine doesn't start up on the hottest days until I drive it around a while. I'm guessing it is a high pressure shut off. maybe it is over charged. when it runs it is god and cold.
 

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Is the pressure sensor for both the high and low pressure levels? Mine doesn't start up on the hottest days until I drive it around a while. I'm guessing it is a high pressure shut off. maybe it is over charged. when it runs it is god and cold.
Yes. There is only one sensor, and the ECM uses it for high and low cutoffs. Overcharged sounds like a reasonable possibility, have you had it serviced where refrigerant may have been added?
 

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No. I have had it about 1 year. I just noticed that my coolant temp is showing "--- F" It may be related because right now the A/C is not running.
 

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Yesterday the coolant temperature started displaying correctly while I was driving and the A/C kicked on at the same time. I'm going to try cleaning the coolant temperature plug and see if that fixes it.
 
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