My heater fan doesn't work on "high".

The shop manual shows a resistor that may be the culprit, but I can't find it.

Any one know where it is located?

Thanks, Frank

 

Look on top of the heater case under the dash. Usually mounted in air flow stream for cooling. Follow wires from fan switch to secret location.

 

You might also check continuity on the switch's high speed position and the wire going to the resistor(s). My wiring diagram shows the low speed using two resistors in series with the high speed using only one of the two used on low.

 

Thanks very much Yellowstatue and Ozzie. I just bought a spare switch just in case that's the problem. Finding another resistor might be a challenge. I know it's group 8.852/#3131533.

Frank

 

A little warmer here today so I ventured under the dash to find the resistor when I got home and there it is, in the heater box. Clear view of the terminals. Lots of corrosion on the connections. I'll clean them off next warm day and see what happens. I don't want to risk breaking off a brittle wire in the cold.

Thanks again Ozzie and Yellowstatue.

Frank

 

By the way, Yellowstatue also answered a similar question back in 2010. Thanks.

I'll have to remember to do a search in the future before starting a new thread.

Frank

 

I don't mind re-answering questions, over and over...it keeps me awake.

 

I was able to reach in and clean all the connections. All set now. I wish everything on this car was that easy. Thanks again.
Frank

 

Frank - My switch does not work on low but it does on high. Thank you for pointing me in the right direction for a fix.


Rick

 

No high speed on my 53, when I turn it on it glows red...

 

Here is the thread from 2010 that I referenced above. It may help.

https://classicoldsmobile.com/forums...-resistor.html

Frank

 

Thank you for that Frank.....I had put this issue on the back burner to get some other bigger jobs done first, then I spotted your thread.
I still need to remove my resistor as you had done and clean the whole thing up and see if that helps, I can't imagine these coils were meant to glow red, get hot perhaps but surely not red, it's a fire hazard and what if a kid ever put their hand in there they'd get seriously burned.