No heat

Tiny
AWDI ITRI
  • MEMBER
  • 2002 MERCURY SABLE
  • 0.6L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 136,000 MILES
Why my heater gives me only cold air? No heat air. I checked everything is working. Blend door. I flush heater core is clean.
Thursday, January 24th, 2019 AT 5:02 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,336 POSTS
Hi and thanks for using 2CarPros.

If the heater core is clean and the blend air door is operating correctly, I suspect there is an air blockage that isn't allowing coolant to circulate through the heater core.

Make sure that both heater core hoses are hot when the engine is running, at operating temp and the heater is turned on. If they are, you need to recheck the blend air door actuator and linkage. Note that the air flow direction (mode door actuator) is operated on engine vacuum. The blend air door is electrically operated, so make sure all connections are clean, tight and not damaged.

Here are directions for removal and replacement of the blend door actuator. I'm adding them to confirm you are testing the correct actuator as well as if you need them to replace the component.

Here are general directions for actuator replacement.

https://www.2carpros.com/articles/replace-blend-door-motor

Here are the specific directions for removal and replacement. The attached pictures correlate with these directions.

REMOVAL
1. Remove the integrated control panel.

See Picture 1

2. Remove the right-side lower instrument panel insulator and glove box.

VEHICLES WITH EATC

3. Remove the 2 remote climate control module screws and position the module aside.

See Picture 2

4. Remove the temperature blend door linkage shield.

See Picture 3

5. Remove the temperature blend door actuator.
1 Disconnect the electrical connector.
2 Remove the screws.
3 Remove the temperature blend door actuator.

INSTALLATION
1. To install, reverse the removal procedure.

_____________________________________________________

Let me know if this helps. Also, if the coolant is going through the heater core and both hoses are hot, the actuator isn't working or the door is stuck which will usually cause a ticking sound.

Take care,
Joe
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Thursday, January 24th, 2019 AT 7:15 PM

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