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Heater/ac air flow problem
04-21-2017, 07:11 PM
Post: #1
Heater/ac air flow problem
[font=Arial][/font]I own a 2005 Lincoln town car, signature series with 113,000 miles on OD.
With the engine on and at normal temp. if I set the temp. control to 60 deg. and turn on the AC unit with fan speed set to high and set the air flow to dash & floor. Compressor and fan work just fine. Under these conditions the drivers side dash 2-vents I get cool air, but out of the passenger side dash 2-vents I get hot air.
Any and all information you can give me about this problem will be greatly appreciated

Thank you, Bob Schaffer78[/size]
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04-22-2017, 10:52 AM
Post: #2
RE: Heater/ac air flow problem
Sorry for the delay.

Found this and thought it might help.

You most likely have a problem with the heater valve or valve circuit. The DCCV is the main component controlling the heating and air conditioning. The valve controls the flow of coolant going to the heater core. When on a/c the module will pulse close the valve so hot coolant does not enter the core. You can clamp off the hoses going to the core to make sure that you do in fact have a heater valve problem if the air cools. You will need to remove that aux water pump and the hoses going to the metal pipes. Then undo the valve from the bracket and lift it out with all the hoses still installed to the valve. Then swap the hoses to the new valve. Also if the module loses the power from the valve it cannot close it off so the valve will default to full heat.

Also found a short how-to video to get you into the diagnostic mode.

https://www.youtube.com/watch?v=3ZclE6I5bMM

Let us know how you make out.
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04-22-2017, 11:56 PM
Post: #3
RE: Heater/ac air flow problem
Hey rupe could this be the same solution for 05 Chevy trailblazer
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04-23-2017, 12:39 AM
Post: #4
RE: Heater/ac air flow problem
Depends on the exact problem. I find that with most GM products it's one of the blend door motors under the dash, which in some cases are a royal pain to get to.... mostly because even after you drop the cover panel there's not really enough room for an adult to fit their head and an arm up there at the same time. OTOH, once you figure out the trick (and which motor is at fault) it's only 2 screws to change the thing.
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