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Old 06-24-2020, 08:16 PM
davidlee's Avatar
Join Date: Mar 2012
Location: Portland OR
Posts: 605
A/C only blows cold at start up and going down the freeway

If I'm doing city driving and stop and go it goes warm
Ac System has full 134a pressure
And the pump stays engaged even when it stops being cold
Any ideas?

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Old 06-24-2020, 08:17 PM
davidlee's Avatar
Join Date: Mar 2012
Location: Portland OR
Posts: 605
Forgot to mention this is a 2001 E320
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Old 06-28-2020, 07:31 PM
Join Date: Oct 2004
Location: NC
Posts: 3,150
Pretty vague description without ambient temp, duct temp and pressures. But your saying its OK going down the high way, no mater how long you are going down the highway.
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Old 06-29-2020, 01:48 AM
lsmalley's Avatar
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Join Date: Oct 2006
Location: California
Posts: 1,983
Sounds like the fan isn't working. Start up, condenser hasn't really heated up yet, but once there it seems like the heat isn't being dissipated during stop and go traffic, unless you are moving to get air through the condenser. Also, could be that the compressor isn't properly compressing unless the rpm's are higher causing it to spin faster....unless it's a variable speed or you are low of refrigerant. In any case, the electrical is easy to rule out, either the fan is working or it's not. Then you'd just need to check the refrigerant in the system, and next move on to the mechanical. Since you have some cooling, it shouldn't be too hard to figure out.


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