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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Oct 2006 Posts: 120 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2006 Posts: 120 | With the Thrift heaters is it possible to get cold air to the defog/defrost ducts at the windshield. With the fan on and the knob to min. air flow I still get hot air. Is that how they were made to work? | | | | | Joined: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | Did you turn off the heater water valve? | | | | | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | With these heaters all the air still goes through the core, so if you want cold air to pass you have to close off the water. The stock "Ranco" valves really don't close it off all the way, even with a rebuild.
Paint & Body Shop moderator
A lone amateur built the Ark. A large group of professionals built the Titanic. | | | | | Joined: Oct 2006 Posts: 120 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2006 Posts: 120 | I'll need the heater from now till spring--then I'll look for those valves and see how it goes.
Thanks! | | | | | Joined: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | Mine is on the water pump. You should have one somewhere on either of the two hoses going to the heater, if not one on the pump with a heater hose on it. | | |
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