Heater

Asked by Medulla Nov 05, 2016 at 07:35 PM about the 1999 Mercury Sable GS Sedan FWD

Question type: Maintenance & Repair

Heater blows cold air replaced heater core and thermostat
And flushed radiator and still cold
Don't know what else to do

3 Answers
64,500

firebird338 answered 7 years ago

Sounds like the blend door is not working. This door opens and closes between the evaporator and the heater core when there is a call for heat or cooling.

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13,095

JP1956 answered 7 years ago

Start by checking all your vacumn lines up under the dash board, and also check all the blend door diapharms that the vacumn lines connect to, using a hand held vacumn pump to see if they are operational or have pin holes in the diaphrams causing an air leak so the doors do not operate properly.

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