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Heat Full Open won't control 700 1983

posted by  someone claiming to be Rob W on  Tue Jan 8 00:02 CST 2002 [RELATED]

My 83 760 heater will not control temperature. The heat is full open. I have tried to do some basic troubleshooting, checking vaccumn lines and operation of the valve in the heater hose. Seem to work ok. I have tried switching out the module under the dash (controls vents) with another module and switched out the temperature controller. Made no difference. (maybe bad too?). I noticed just before this problem started, I could hear a relay chatter, as if a relay was going bad. But that only seem to affect the blower. The blower is working fine too. Does anyone have any insight? Thanks!






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