defroster problem
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defroster problem
My defroster only works on the cold side when the ac compressor is on but when I put the temp control on hot the compressor shuts off and the windows fog up. Could be the heater core is leaking but no coolant dripping in the cab. Wouldn't it fog up both cold and hot with a leaky heater core? Any suggestions would be great. 1971 f250 camper special factory ac
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Joined: Nov 2006
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From: Simi Valley, CA
My defroster only works on the cold side when the ac compressor is on 
but when I put the temp control on hot the compressor shuts off and the windows fog up.
As John said, the A/C systems on these trucks don't work this way. Ditto 1973/79.
Could be the heater core is leaking but no coolant dripping in the cab. 1971 F250 Camper Special with factory A/C
but when I put the temp control on hot the compressor shuts off and the windows fog up. As John said, the A/C systems on these trucks don't work this way. Ditto 1973/79.
Could be the heater core is leaking but no coolant dripping in the cab. 1971 F250 Camper Special with factory A/C
Heater core is seeping coolant into the A/C/heater plenum chamber. When defroster activated, vapor fogs up windshield. Common problem that affects all vehicles with leaky heater cores with or without A/C.
Be aware that the heater core (C8TZ-18476-A) used with factory A/C is different than without. No Ford Dealer or obsolete parts vendor has any. I doubt autoparts stores will have it.
You'll have to take it to a radiator shop and have it recored.
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