On some years there is not enough travel in the heater control lever/knob
to fully open the heater valve. Some people adjust it so that it will not
close all the way in the winter and then again when it warms up so that it
doesn't open all the way.
Someone posted a long time ago about reworking the value to get more volume
through it. It has pictures and was on a website.
My experience is to be careful with that value. They put it right above the
distributor, and it is known to fail, dumping coolant. I ended up using a
bit of an aluminum can to block mine of when it broke and soaked my
distributor one year.
On Nov 25, 2013 8:36 AM, "Mark" <mark@nashvilletn.org> wrote:
> Here is my first post regarding my recently acquired 67 BGT. I was
> sorting out the heater air flow control mechanical switch this weekend and
> ran into a problem. The spring on the shaft of the air control that holds
> the knob is missing. Someone in the past had put a set screw in the
> plastic knob that fit poorly in hole in the shaft that held the detent.
> The switch works but not well. I see that the usual sources don't have
> the replacement switch and the plastic won't hold the set screw for long.
> are there any good options to fix the shaft? Maybe a replacement spring
> and detent? I also have minimal flow of hot water through the heater core
> and have ordered a new heater control valve. I need to flush the cooling
> system anyway so I will replace the valve when empty the radiator.
>
> Thanks,
>
> Mark
> Nashville
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