Location of F150 1997 heater control valve

SOURCE: Heater fan only works on high speed 4.

sounds like the switch is bad. Test the power coming in to the connector and use jumpers to get the fan to operate at all 4 speeds. if it works then it the switch.

Marvin

• 85242 Answers
• Posted on Dec 28, 2008

SOURCE: location of the heater control valve

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.

SOURCE: location of heater control valve 2005 grand prix

i don`t think there is a heater control valve.you may have an air pocket in system.

SOURCE: where is the heater blower motor resistor located

It is located right next to the blower motor because it stays cool with the air from the blower and I think it has a 4 wire connector depending on how many speeds there is on the control.

SOURCE: 1997 Jeep Cherokee - Blower motor stopped working.

Check the relevant fuses with a test-light or VOM, don't just "eyeball" them as they often break at the very end. Then check the heater/A/C relays on the electrical panel. The heat/cool is controlled by a stepper motor which opens and closes the air "mixing box", but it won't work with a bad relay. If all of those check-out, you need a OBDII code reader to check the "engine" computer, as it controls the electrical modules. Also check the fusable links going to the electrical panel, and the cable from the battery to the panel. The cable may be corroded in-two and you'll never see it, so no juice to the panel, no juice to the heat/AC system. (I had a Dakota do that.) PS: Double check the grounds that they aren't corroded. Learned about that from a BSA Gold Star production racer.....

Testimonial: "Many thanks, Walker. Tt was the fuse in the kick panel. Looked ok, but NO continuity. I used the 10A spare and everything worked. Thanks!"