Chev truck heater problem-HELP!

Replace the switch that controls the fan (the knob/console thing). Each fan setting uses a different circuit with a resister. If it only works on high, you've lost the first 3 settings or so.

3 speeds don't work. I replaced the heater blower fan motor but still only the high speed works. Any help would be greatly appreciated! Thanks

OK Look next to the blower you will see a electrical connection to the blower speed module....Held in with 2 or 3 5.5mm screws ..Pull it down if the green coating is burnt or peeling off in any way there is your problem... This is very common and id check it first..If you go get a switch you will not be able to take it back if it dont fix the problem.... Better safe than broke Steve C

Re: Chev truck heater problem-HELP!

3 speeds don't work. I replaced the heater blower fan motor but still only the high speed works. Any help would be greatly appreciated! Thanks

OK Look next to the blower you will see a electrical connection to the blower speed module....Held in with 2 or 3 5.5mm screws ..Pull it down if the green coating is burnt or peeling off in any way there is your problem... This is very common and id check it first..If you go get a switch you will not be able to take it back if it dont fix the problem.... Better safe than broke Steve C

Call it a module if you want but it's just a resister block if I remember correctly. I think we are talking about the same part. Bob

No I think he needs a blower motor resistor not the fan switch.'

rfs