On My 2003 Mercury Grand Marquis my ac does not blow hot or cold air. It just blow cool air. It gets cold at night time though.

10

Asked by Sep 13, 2013 at 10:15 AM about the 2003 Mercury Grand Marquis LS Ultimate

Question type: General

AC doesn't blow hot or cold!!

7 Answers

25,305

The Heater core could be clogged. Check to make sure that the coolant is full and flowing at operating temperature. You may need a cooling system flush (or back flush)

1 of 1 people found this helpful.
28,145

Blend door actuator stuck?

1 of 1 people found this helpful.
25,305

That's a possibility kbro. And a bummer to change out.

2 of 2 people found this helpful.
28,145

Dash has gotta come out for that one right?

1 of 1 people found this helpful.
10

yes

10

I can control the speed of the blower but not the temperature!!!

1 of 1 people found this helpful.
25,305

Yup. That's a Blend Air Door Actuator. It sits on top of the heater case tucked under the dash. You can try accessing it through the glove box by pulling the glove box, passenger's air bag and right vent ducting BUT....you run the risk of damaging the heater case and tearing up your arms.

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