Thread: auto heat
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JFairman JFairman is offline
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,157
My autoheat box was doing something like that five years ago so I took it apart and looked inside.
First, it's an over engineered piece of crap and the old hand lever system was much better and worked great. It's worth backdating to the 70's hand lever system when the autoheat box goes bad.

Anyway, the geared down servo motor that slowly pulls the cables to open the diverter valves that send hot air from the heat exchangers through tubes in the left and right longitudinals to the footwell blowers also turns a steel cam wheel with a tang that trips a microswitch that turns on the footwell blowers.
The tang can be bent and that changes when the blowers come on.
I've forgotten everything I did but I bent the tang a little and now it works better. Before I did that the footwell blowers took a really long time to come on and now they come on right away when I turn the knob all the way clockwise.

There's more to it but I have heat when I want it now and turning the knob counter clockwise in steps slows down the blower fans.
Sometimes it gets chilly in S. Florida and it's nice to have heat.
Old 01-28-2014, 07:53 PM
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