A/C question
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Mountain Pass
Joined: Feb 2022
Posts: 103
Likes: 14
A/C question
My A/C is not as cold as it should be while I'm idling, but it cools well on the highway. I realize that there are several possible reasons for this, but is there any harm in putting in a can of R134 that I already have, just to see if it works? If I don't check the pressure with a gauge, is it possible to damage the system by overfilling it or would it merely be a waste of R134? Also, if I were to purchase a set of gauges to check the coolant pressure, what are the normal ranges? This is a 1994 with a 302, in case that's relevant
Cross-Country
Joined: Mar 2008
Posts: 97
Likes: 9
From: KS
Bingo. Is your fan shroud still intact and in place? If not, then that coupled with a possible bad fan clutch would be the culprit. Basically there is not enough air blowing across the condenser at idle to lower the high side enough.
Hotshot
Joined: Jul 2020
Posts: 10,534
Likes: 2,664
From: Near Salt Lake City
You can check the cycle time charts in the service manual
That will give you an indication of charge without having a gauge set
That said, gauges are really cheap these days
Get a set
Then sitting static and off, both gauges should read about 80 lbs with a filled system
Then when you start the compressor running the low side should be around 30 when full and the high side pumping up to 150 or more
If yours is cycling quick, that is an indication of low refrigerant charge
That will give you an indication of charge without having a gauge set
That said, gauges are really cheap these days
Get a set
Then sitting static and off, both gauges should read about 80 lbs with a filled system
Then when you start the compressor running the low side should be around 30 when full and the high side pumping up to 150 or more
If yours is cycling quick, that is an indication of low refrigerant charge
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ajg617
6.0L Power Stroke Diesel
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Nov 9, 2014 10:06 PM
