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Ford Probe
Heater Cores and Blower Fans
Ford Explorer Sport
Car Heaters

Why would a heater quit blowing?

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Wiki User
2007-01-04 05:57:26
2007-01-04 05:57:26

Have you checked the fuse under the dash? Are the other temperature controls working? It would most likely be the blower motor if the fuse is good and the controls work. It could also be the Thermal Overload switch, which is mounted in the blower motor housing by 2 screws if I remember correctly. My blower motor quit blowing and I switched EVERY component individually with parts from a second car. All of the components worked. I even measured the voltage which read the same on both cars. I was completely baffled until I found a comment online somewhere regarding a component near the battery--I don't recall if it was a relay, power transistor, or what. At any rate, there are two nondiscript black square things attached directly in front of the battery with wiring connectors. One of these is for the blower fan and can have a broken wire or corroded connector. In my case, once I knew to look at it, I found a wire had broken off. After re-connecting it, everything worked fine.

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