After car has warmed up A/C blows warm to hot air

GBALDOWSKI

MEMBER
1999 LINCOLN TOWN CAR
V8
2WD
AUTOMATIC
84,000 MILES

My climate control seems to blow warm/hot air after the car is warmed up and it sometimes seems like the air intake is restricted. The A/C compressor works and cycles on and off but does not blow cold air. Even in the vent position with the temperature set to 60 degrees, warm air comes out of the vents.

Thank you.

4 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Good evening,

This sounds like the fresh air door is stuck open. The actuator is right behind the glove box.

I attached the pictures and the procedure is below for this procedure.

Roy

REMOVAL

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1. Disconnect the glove compartment door damper cable.

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2. Release the stops and lower the glove compartment door to the floor.

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3. Disconnect the wire harness connector.

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4. Remove the four screws and remove the electronic recirc door actuator.

INSTALLATION
1. Follow the removal procedure in reverse order

Images (Click to make bigger)

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Monday, May 11th, 2020 AT 3:41 PM

GBALDOWSKI

MEMBER
3 POSTS

Thank you for your prompt reply. I do know that the fresh air door does open and close at times but this does not change the amount of air flowing out of the vents.

I believe there could be something wrong with the blend door also (I don't know if this affects overall air flow). I performed the EATC Hard Self-Test and fault numbers #24 came up (blend door short or fault) and #16 (which I was not able to find the description for this code).

The other symptom I have is warm air comes in from the vents when the engine has been warmed, temperature is set to 60 degrees, and outside temperature is below 60. I can't get cool outside air when it is cool outside (not in A/C mode).

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Monday, May 11th, 2020 AT 4:14 PM

GBALDOWSKI

MEMBER
3 POSTS

I do know that the fresh air door will change position (I believe to the recirculate position) when the fan speed is set to high. This occurs even in the vent or floor settings which I believe should not be recirculating at these settings. Could this happen if the fan is trying to move a large amount of air and there is a restriction of getting air from the outside source forcing the fresh air door to change it's position? I know this model does not have an air filter for the inside cabin.

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Monday, May 11th, 2020 AT 4:18 PM

ASEMASTER6371

MECHANIC
52,797 POSTS

Okay, the volume issue could be either a blower motor issue with the cage on the end or a leak in the duct work in the vent system.

https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only

As far as the warm air, there is a blend door motor on the A/C unit. It is at the top of the dash requiring the dash board to be remove to access it. That is a common failure for this and the code you got from the A/C control head.

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

I attached the procedure below and pictures for you as well.

Roy

REMOVAL
1. Disconnect the battery.
2. Remove the instrument panel steering column cover.
3. Remove the RH and LH instrument panel lower insulator panels.

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4. Remove the steering column opening brace.
5. Disconnect the steering shaft universal joint.

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6. Remove the RH and LH cowl side trim panels.
7. Release the glove box door, and remove the two screws from the center instrument panel support.

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8. Remove the instrument panel defroster grille.
1. Unclip the instrument panel defroster opening grille.
2. Disconnect the connectors.
3. Remove the instrument panel defroster opening grille.

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9. Remove the RH and LH upper moldings.

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10. Remove the three instrument panel cowl top screws.

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11. Remove the RH instrument panel cowl slide nut.

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12. Remove the upper LH instrument panel cowl side nut.

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13. Remove the lower LH instrument cowl side bolt

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14. Reposition the instrument panel rearwards.

NOTE: Repositioning the instrument panel requires two technicians.

15. Cut the insulator and position away from the actuator.

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16. Disconnect the connector.

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17. Remove the screws and remove the electronic blend door actuator.

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