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Heater Control Valve or Clogged Heater Core? 200

1981: No heat. I looked at the heater control valve and found the cable broken. But even manually putting the valve in the hot position, I get no heat at all. I'm thinking this could be the fault of a bad heater control valve or possibly a clogged heater core. How do I diagnose further? Or should I replace the valve and see if that fixes the problem?
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Thanks everyone for all the information and advice, Doug C. 81 242 Brick Off Blocks, stock, B21F (non-Turbo), M46; 86 244, B230, 140k , auto.






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