Heater question on a '77 M880

Posted by wrc on Friday, March 02, 2001 at 7:08AM :

I have installed a new cut off valve in the heater hose, one from top of engine beside the hose going to top of radiator. Still alot of hot air coming out of heater in cab. Is this normal or what can I do to stop the heat in the cab before warm weather hits?

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