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Are you talking about the display goes on and off ( fan will start and run, then stop, display goes blank ), or the AC ? Is this the Electronic Automatic Temp Control ( Lariat, King Ranch, FX4-Lux ) or the Electronic Manual Temp Control ( XL, XLT, FX2, etc ) ?Are you talking about the display goes on and off ( fan will start and run, then stop, display goes blank ), or the AC ? Is this the Electronic Automatic Temp Control ( Lariat, King Ranch, FX4-Lux ) or the Electronic Manual Temp Control ( XL, XLT, FX2, etc ) ?
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Go to www.autozone.com and register for free. Registration gives you access to vehicle guides and manuals were you'll find a diagram of the fuse panel.
your problem is caused by the air temperature control blend door actuator motor being defective, the little motor moves the door that gives either hot air or cold air or a blend of the 2.
There are 2 hoses going through the firewall from the engine, these are the coolant hoses to the heater core, one is 3/4" and one 5/8", the control valve should be in the larger line (3/4") which is the inlet, make sure that the valve has vacuum (heater on low), also check and see if both hoses get hot with the heater blower on low, if they do get hot your problem is not the heater control valve but the air temp control blend door actuator.
Are you talking about the display goes on and off ( fan will start and run, then stop, display goes blank ), or the AC ? Is this the Electronic Automatic Temp Control ( Lariat, King Ranch, FX4-Lux ) or the Electronic Manual Temp Control ( XL, XLT, FX2, etc ) ?
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