Hvac system

[Christoph006]

I’m trying to get my hvac system to work normal again in my 95 C3500. I replaced the temp control panel, tested the blower motor and it works, and had to splice in a new connector on the purple power wire to the blower motor cause the previous owner was a bit of a *****. I’m going to replace the heater core as it may be clogged.

I can change the temp of the air but changing the air speed from Lo to Hi changes nothing. It trickles our very little of the defrost. Is it just the heater core the issue or something else like actuators or blower motor resistor?


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[Lanny]

Can you hear the pitch of the blower motor changing when you turn the stwitch? If its getting heat its probably not a heater core issue, unless something is blocking airflow.

 

[grampadirt]

Might be your heater core is just full of crap,mine was.Removing the cover and cleaning it out helped a bunch.I also used compressed air and blew backwards from the floor vent which helped also.Keep in mind these old truck didn't have a cabin filter.

 

[Christoph006]

Can you hear the pitch of the blower motor changing when you turn the stwitch? If its getting heat its probably not a heater core issue, unless something is blocking airflow.

I don’t hear the blower motor at any level


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[Lanny]

Well id clean it all out as well as you can then if you still cant get decent airflow then change the blower motor. Rockauto has them for pretty cheap.