a/c problems
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Joined: Aug 2006
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a/c problems
I have a 99' F-350 7.3L powerstroke and i'm having a/c problems, the a/c will only work on high speed but not the other 3 speeds also when it is really hot outside the a/c will not work at all, i have replaced the switch and the blower motor. my wifes dad said it might be a vacuum hose but i'm at a loss. can someone please help?
Thanks
SGT
Thanks
SGT
….
Tuned
Joined: Feb 2003
Posts: 495
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From: Cincinnati, Ohio
This sounds like it could be your problem. It is from the PSD service CD.
John
The heater blower motor switch resistor has the following features:
John
The heater blower motor switch resistor has the following features:
- The assembly is located on the evaporator core housing in the engine compartment.
- Three resistance elements are mounted on the resistor board to provide four A/C blower motor speeds.
- Depending on the heater blower motor switch position, series resistance is added or bypassed in the A/C blower motor circuit to decrease or increase A/C blower motor speed.
- An overheating protective device (thermal limiter) will open the resistor coil circuit when the temperature reaches 121°C (250°F) , interrupting the blower motor operation in all speeds except HI.
- The thermal limiter cannot be reset and is not repairable.
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