no heat, help please

Bernie Benz b.benz at
Wed Oct 31 12:20:35 PDT 2007

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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