2004 ac help!!!!

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Old 07-29-2016, 05:50 PM
Stone1968's Avatar
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2004 ac help!!!!

2004 f150 lariat 5.4L

AC blows only cool sometimes, other times hot

Vent temps 75-80

todays test numbers:

ambient air - 95

Low side- 100

High side - 200
compresser clutch engaged and running during test

What would cause low pressure reading so high???
 

Last edited by Stone1968; 07-29-2016 at 06:07 PM.
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Old 07-29-2016, 09:14 PM
projectSHO89's Avatar
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Worn out or weak compressor (leaky valves), for one possibility. There are others.

Shut the engine off and allow the readings to equalize. Record and report. Then start the engine back up and watch the gauges. Observe and report.
 



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