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Paul M ASE Master
Paul M ASE Master, ASE Master Tech
Category: Car
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Experience:  Ase Master 20+ Years Experience Foreign and Domestic
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1991 mazda B2600: I used radiator leak sealer..selector valve

Resolved Question:

1991 mazda B2600-p/u truck. "No Heat," This problem seems to have started after I used "radiator leak sealer" and erroneously failed to open or select "heat" during this process.. I have replaced thermostsat, but I suspect the selector valve may be stuck shut. If it is the problem, how do I find the valve and how do I replace it ..I can move the selector knob, and have disconnected cable at actuator.. it moves very freely..could this be a sheared shaft to valve ???
Submitted: 5 years ago.
Category: Car
Expert:  Paul M ASE Master replied 5 years ago.

Hello and thank you for using Just Answer

I'm Paul and I will help you with your Question


the cable is connected to a Blend door not an actuator


the heater core gets hot coolant all the time


bring the truck up to temp and go under the hood


hold both heater hoses that go through the firewall


if one is hot and the other is not the heater core is restricted


the only chance you have at clearing it is by removing both heater hoses from the core at the firewall


use a garden hose to backflush the core in both directions


let me know what you find and if you need more help



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