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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: May 2005 Posts: 8,983 Sir Searchalot | | Sir Searchalot Joined: May 2005 Posts: 8,983 | Delky is right on with advice. The heater is very simple. You probably know all this already:
You have 4 levers. One is just an electrical switch for fan motor. Three are cable. Two of those operate "flappers" inside the sheet metal. One for choosing outside air or recirculating inside air. The other flapper distributes air to cab or defrost. The last cable operated an internal valve. It is just a water valve. More water, more heat. Less water, less heat. On your truck this internal has been abandoned/bypassed in favor of an inline, cheaper, and easier to install, valve. That valve you have could be operated by your dash knob/lever or a separate method.
Some valves have a temperature sensing feature, I think. Not necessary. Your outside valve is fine. Obviously you can observe these workings by just finding the cables and the flappers.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
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