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AC Icing Up on '86 Carrera
While driving from Austin to Houston yesterday afternoon I had the AC on - it ran solid for over an hour but eventually stopped blowing cold air. I popped the hood when I got home and saw a line iced up. Any idea what would cause this? Ambient temperature was about 80 and the humidity was low.
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Noah 1986 3.2 Carrera | Iris Metallic Blue 2022 Macan S | Gentian Blue |
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03-23-2019, 12:04 PM
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Join Date: Jun 2013
Posts: 491
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It probably stopped blowing cold air because the evaporator iced up as well. Most likely due to a faulty thermostat or the thermostat probe becoming dislodged from the evaporator matrix.
You didn't notice the compressor was being run continuously and not cycling? You could try running it at 3/4 of max cold setting rather than fully cold to see if that prevents the evaporator icing. |
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03-23-2019, 01:53 PM
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Join Date: Jun 2009
Location: Manhattan Beach, California. Factory Delivery-Original owner-Retired engineer
Posts: 5,238
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A/c
 ^^^^^ Try these control settings.  ^^^^^ Also, because it is almost impossible to determine the compressor on/off cycle while the car is driven, I added an LED across the compressor circuit as an indicator. Please provide additional data such as to when the issue sstarted, refrigerant type, any A/C modifications ect... Is the evaporator drain plugged up? Your local A/C shop should have a look & hang some diagnostic high/low side gauges. Also, an open thermostat wire will not allow the compressor to engage, which is not your problem. Send a pm to Kuehl-He is the man!!!! Best, Gerry
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1986 911 Targa. Per Road and Track magazine: Only in L.A.: In the window of a bar in Hermosa Beach, California. "Happy Hour prices during all car chases." Last edited by 86 911 Targa; 03-24-2019 at 11:31 AM.. |
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03-23-2019, 02:55 PM
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Join Date: Feb 2009
Location: Knoxville, TN
Posts: 1,347
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Could be a little low on referigerant
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03-23-2019, 03:24 PM
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