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Old 09-02-2008, 02:52 PM
bobs's Avatar
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Join Date: May 2007
Location: Richmond, VA
Posts: 310
Speed of A/C cool-down?

OK, here's something I have been researching for a while but have not been able to find an answer for. The A/C on my '97 S420 gets nice and cold with an evap temp of 39-40 *F, but it takes a L O N G time to get there. I'm talking almost 10 minutes when the car runs at highway speed.

My S320 by comparison gets down there very quickly, say 2-3 minutes.

A glance at the A/C diagnostics looks normal to me. Coolant temp stays at around 185, refrigerant pressure sits at 8-10 while on the highway and will climb to 14-15 when going slow or idling.

Anyone ever seen this?
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"It's not about how fast you can go, but how well you can go fast."

Bob in Richmond

'97 S320 (LWB), Ruby Red Metallic, 73k miles
'97 S420V, Smoke Silver Metallic, 155k miles
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