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2001 Honda Civic overheating when heater turned on

Discussion in 'Engine Tech / Drivetrain' started by roblar1958, Dec 29, 2008.

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  1. roblar1958

    roblar1958 New Member 5+ Year Member

    Dec 29, 2008
    Long Beach
    I have a 2001 Honda Civic Ex that has 85,000 miles. Everything works great until I turn on the heater. The heater air will intermittently just start to blow cool air then it starts to overheat. Have replaced thermostat, sensor, engine temp sensor, timing belt, water pump, radiator flushed, coolant level fine, heater core checked and cleaned, fan belts replaced, ac refrigerant charged...at wits end! I was told there is some sort of valve that is controlled by vacuum that allows the heated water into the heater core which then blows the warm air that could be faulty, but could that cause rest of engine to overheat and also to suddenly blow cool air instead of warm?
  2. boxinggsxr

    boxinggsxr New Member Registered VIP 5+ Year Member

    Dec 28, 2008
    the same s**t happens to my 03 civic lx it fukn sucks if i turn on ac or heater and it sits for 5 min i gotta shut it of cuz the engine will overheat
  3. AliasNeo

    AliasNeo New Member Registered VIP 5+ Year Member

    May 10, 2005
    change the thermostat.

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