Heater only blows heat on highest setting


New member
Hello all, hope that you can help my heater fan works fine but only blows out hot air on highest setting, been reading through some mechanic sites that it may be the blower motor control module/ resistor module, but have not been able to find a part # or tutorial on how to replace this DIY... any help would be great, thanks!

Autoworker 74

New member
I had a 1977 Pontiac Bonneville and it had the same issue. Would only blow on high. Back then the heater hung on the firewall and was an easy fix. No idea about a 2010 anything. It's been a long time since I went under a hood for a repair.


New member
Definately the blower motor resistor, inexpensive part that is located in the blower motor box under the passenger dashboard. easy fix

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