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Re: Functioning heater controls?

Subject: Re: Functioning heater controls?
From: Larry Hoy <>
Date: Thu, 06 Sep 2001 10:26:55 -0600
It's not clear to me whether you have too much heat or not enough.  There 
are several common heater problems.  Plus some odds 'n ends just thrown in.

1) a design flaw in the control system results in not enough movement in 
the control mechanism to fully open or close the valve.  It's a good idea 
to re-adjust for winter vs summer.  Make sure it fully closes in the 
summer, and fully opens in the winter.

2) if you have too much heat in the summer, it is not likely the heater is 
at fault.  Plug all firewall holes, no matter how small they 
seem.  Insulating the firewall, floors and tunnels is a good idea too.

3) if the valve leaks be prepared to walk, it may result in a wet 
distributor.  If it doesn't stop your car you may loose enough coolant to 
blow a head gasket ...

4) re-seal the heater door flaps.

5) fan motors can be lubricated, this may revive a dead motor.

6) defroster not working?  Reconnect the tubes under the dash.

Larry Hoy

At 08:55 AM 9/6/2001, wrote:
>In a message dated 9/5/01 8:25:04 PM Eastern Daylight Time,
> writes:
> > The cable and heater valve are both new.  The cable slides smoothly inside
> > the sheath.  The valve action is smooth, and stays closed once snapped 
> shut.
> > I've got the cable sheath firmly clamped at both ends and the slack 
> removed.
> >
> > I've tried adjusting with the valve and dial fully open and fully closed,
> > but I
> > dont get full range of travel with either.
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