Vacuum water valve - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72 K20 · 11-17-2018, 01:42 AM

Could someone tell me how many inches of vacuum are required to open the water valve ?
My truck only carries around 10 inches of vacuum at idle and I am not getting much heat in the cab .
Motor runs right around 195 - 200 degrees'.

New heater core , valve, and hoses . One hose is hot ,, the other is warm .

I hooked the valve directly to manifold vacuum and no change.

Wondering if I got a bad valve ............... tomorrow I'm going to try taking the valve out and just splicing the hose together .

Give me some things to check , tips , info !

Thank You ! Tom

11-17-2018, 01:42 AM	#1
72 K20 Registered User Join Date: Mar 2011 Location: Brandon,Iowa Posts: 391	Vacuum water valve Could someone tell me how many inches of vacuum are required to open the water valve ? My truck only carries around 10 inches of vacuum at idle and I am not getting much heat in the cab . Motor runs right around 195 - 200 degrees'. New heater core , valve, and hoses . One hose is hot ,, the other is warm . I hooked the valve directly to manifold vacuum and no change. Wondering if I got a bad valve ............... tomorrow I'm going to try taking the valve out and just splicing the hose together . Give me some things to check , tips , info ! Thank You ! Tom

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