Engine Size: 4.6
Refrigerant Type: 134a
I have not checked pressures yet the ac does not blow cold enough out of the vents the accumulator and hose going to it are ice cold. I ran eatc diagnostics no codes but the eatc started blowing out the defrost about a month ago I checked all vacuum sources narrowed it down to the control head I ran main vacuum to vent so the air comes out of the vents all of the time no need for defrost in florida this time of year. Don't know if this could be part of the problem I don't believe the vacuum has any thing to do with the blend door I think that is electrical. any ideas appreciated
well if you had to bypass the control head, it may have the blend door in a nutral half and half positon or somthing. Possibly not closing all the way. Fix your electrical/vacuum problem first I would say.
1990 Pontiac Turbo Grand Prix
1990 Pontiac 6000 LE V6
Both have R12 A/C
If the accumulator and suction line are ice cold, it's working, I would look for a blend door problem, possibly a broken lever that closes the door...
Freedoms just another word for nothing left to lose
Wrong Reply button. Sorry.
Edited: Wed August 05, 2009 at 8:42 PM by newton5
EATC controller failures and Blend Door Actuator (electronic) failures are very common on mid 90s and newer Town Cars. It sounds like you may have both. The BDA is an electronic stepper motor and not vacuum controlled.
The controller has a built in Self Test. Here's the procedure: http://www.lincolnsonline.com/tech/00128.html
Since the EATC controller is easy to replace and known to be defective in some way, replace it first. It "might" solve the whole issue. Replacing the Blend Door Actuator requires removing the instrument panel.
Oh, and there is no way to force the blend door full cold without removing the actuator. That's usually the very next question folks ask when they find the IP must be removed to replace the actuator.
If you tackle the BDA replacement, replace the heater core while you're in there. All too often the core springs a leak shortly after, requiring IP removal again. The two aren't really connected, it's just a Murphys Law kind of thing. At 14 years it will be cheap insurance.
Use ONLY a Motorcraft BDA! The Dorman replacements have a very high failure rate.
Here's a link to the BDA replacement procedure: http://www.lincolnsonline.com/tech/00175.html
The writeup is for 90-94, but your 95 is almost identical in the steps involved.
Edited: Wed August 05, 2009 at 8:43 PM by newton5
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