Question about 1996 Ford Ranger SuperCab

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My A/C only blows cold in MAX position. All other positions, both A/C and heater, blow full hot. I also can not control temp via thermostat. Anyone know what the problem is? Thanks.

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Check your heater control door and actuator. make sure they are operating properly. The doors are known to break,and the actuators can go bad. The a/c works on max because there is a heater control valve that shuts the coolant flow into the heater core.

Posted on Nov 16, 2009

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1998 gmc surburban. front blows 82 degrees, rear blows 48 degrees. ambient is 91 degrees. this is with max-recirc-full tilt.the valve for the heater core does not change position no matter where i put the...


Hi John,
Your right with your diagnostics, you have a blend door problem. If your switching to cool air and it is still hot then you also have a heat exchange unit fault, this is the component that changes the water flow from hot to cool by shutting off. If it is not operating correctly this will give you constant hot air no matter where you temperature switch is positioned.
As for the warm air while the engine is cold, sounds like the blend door is still open to atmosphere tempreture and if it is hot outside will pull that hot air into the inside of the vehicle.
Have the heat exchange valve checked, and the only way the check blend door operation is to remove the wiring from the blend doors and have the circuit tested. If the circuit is ok then the blend doors will need to be replaced.
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Check your coolant level and make sure its full, next i would look into replacing your thermostat, if your thermostat is stuck open your engine isnt able to reach operating temperature therefore heater output suffers, your coolant temp gauge should read around halfway when the engine is hot if its not look into replacing the thermostat, if your gauge is reading halfway check the cable going to your heater box when you adjust your temperature on your heater controls its possible that the cable broke or the blend door inside the heater box is stuck into the cold position allowing only cold air to come through the vents.

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1 Answer

Heater blows cold


If no coolant flowing through the heater core then ther is no heat. There are 2 possible root causes needed to check out: 1- THE VALVE TO CONTROL THE COOLANT FLOWING TO THE HEATER CORE IS NOT OPENING AS DESIRED. 2- THE HEATER CORE GOT CLOGGED UP AND NEED TO BE FLUSHED.

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