Maybe the expansion coil frosted over... - Saab 900 Bulletin Board - Saabnet.com
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Maybe the expansion coil frosted over...
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Posted by Walt [Email] (#2707) [Profile/Gallery] (more from Walt) on Wed, 22 Jun 2016 05:35:13 Share Post by Email
In Reply to: A/C suddenly quits, TXgardener [Profile/Gallery] , Wed, 22 Jun 2016 03:24:48
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and the anti-frost switch finally sensed this condition and shut off the compressor clutch for a while to let coil de-ice. When the anti-frost switch is working properly, the A/C clutch should slowly cycle on and off. Most likely fault is the temperature sensing bulb at end of white insulated copper tube connected to anti-frost switch has pulled out of evaporator coil, which would explain why the coil iced over. A dirty evaporator coil is prone to icing. Bulb can be re-positioned from top of fresh air entry duct, but don't put any sharp bends in the tube. Bentley manual says anti-frost switch should open at 33 to 36.6 degF and close at 39.2 to 43.1 degF (compressor clutch engaged) if you have a flexible digital thermometer.

Another possible reason for lack of A/C is high coolant temperature switch in top radiator hose. This switches off compressor if coolant temp exceeds 239 degF according to Bentley manual.

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