A/C on with heat?
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Joined: Jul 2006
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From: Hamburg PA
A/C on with heat?
hi after finally fixing the thermostat and water issue with my dads truck we still cant get any heat in the cab. when the heat is turned on the a/c compressor is randomly cycling on and off we tried replacing the switch in the cab but nothing changed any ideas?
thanx guys
almost forgot its a 97 f150 xlt ext cab
thanx guys
almost forgot its a 97 f150 xlt ext cab
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Joined: Jan 2004
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From: St Louis
Originally Posted by Thomas Hutchins
I do believe that you will find that the only switch position that the AC does NOT cycle is in the Panel position.
Steve
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I concur, when all else fails-read the manual.
"Actually, FLOOR, PANEL, and OFF. See the Owner's manual"
Note any possible confusion w/the 'PANEL & FLOOR' position, where AC can run. Only the FLOOR or PANEL positions provide heated air w/o AC. Then cab heat is adjusted by mixing in fresh outside air in FLOOR or PANEL-the heater core should circulate hot coolant whenever the motor runs. The other positions mix heat & AC.
I believe there's also a low temp limit switch that cuts out AC below a certain temp.
"Actually, FLOOR, PANEL, and OFF. See the Owner's manual"
Note any possible confusion w/the 'PANEL & FLOOR' position, where AC can run. Only the FLOOR or PANEL positions provide heated air w/o AC. Then cab heat is adjusted by mixing in fresh outside air in FLOOR or PANEL-the heater core should circulate hot coolant whenever the motor runs. The other positions mix heat & AC.
I believe there's also a low temp limit switch that cuts out AC below a certain temp.
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From: Hamburg PA
Originally Posted by yankee7985
The compressor will be on when the switch is in any position but panel. It will be on when in the heat mode.
It sounds like your blend door is broken.
It sounds like your blend door is broken.
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Brett Foote
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From: Louisville, Kentucky
Try switching the temp **** for the fan ****. The ***** tend to crack and split, then spin on the temp control shaft. Results in the temp not actually changing. if this doesn't help then go for the blend door. Good luck! 
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