my 2009 mercury grand marqus

Asked by Dec 17, 2015 at 01:54 PM about the 2009 Mercury Grand Marquis

Question type: Maintenance & Repair

my heater does not heat

3 Answers

765

With the engine warmed up and turned off. Check the heater hoses under the hood. Be sure they are both hot. If only one is there is a plug of some kind in the heater core or the hoses. If both are hot then it may be the blend door actuator not functioning. Heater core plugs can be removed with garden hose pressure on a cold engine. Remove both hose from the engine and run water through them till it appears the water if flowing freely. Reconnect and try heater with warmed up engine.

2 of 2 people found this helpful.
765

When i mean by a heater core plug, i am talking about a mass of rust, coolant solids and metal the make up a gooey ball that can plug up the heater core. Have flushed a few of the these out over the years.

6,705

Ditto sherrifstech

1 of 1 people found this helpful.

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