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lesterdarnell
lester ... 12/26/2012
2000 Mercury Grand Marquis LS 8Cyl4.6L - Body & Interior
1988 Lincoln,the heater heats on and off
The heater heats a while and how cold
1 Answer
  • Jimm
    Jimm 12/29/2012
    Several possibilities; incorrect coolant mixture (not at 50/50 anti-freeze and water mixture), faulty heater control valve, faulty / clogged heater core, faulty / clogged heater hoses, faulty heater blower motor, faulty blower relay or fuse.
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