no heat, help please

Mike Miller mikemilr at
Wed Oct 31 15:30:34 PDT 2007

You can remove the heater control valve entirely and replace it with a 
straight piece of pipe ( as I recall, as 5 inch long 3/4in galvanized nipple 
worked well - I carry one with me now) and still have heat. I did that in 
Las Vegas around Thanksgiving last year when I lost my HCV.


----- Original Message ----- 
From: Bernie Benz
To: Tom Egbert
Cc: 200q20V mailing list
Sent: Wednesday, October 31, 2007 1:20 PM
Subject: Re: no heat, help please

The HCV is a normally open valve, vacuum closed, so with the vac hose
removed, for sure you should have water flow. Are the heater supply
and return hoses warm? If so you have hot water flowing. Next look to
the air system for your problem.


On Oct 31, 2007, at 11:47 AM, Tom Egbert wrote:

>   A/C system still works normally but no heat in the chilly morns.
> No codes from the A/C control head.
>      Can I  manually apply vacuum to the heater control valve and
> eliminate some possibilities?
>                                                TIA,Tom
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> 200q20v mailing list

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