FOUR MOST COMMON MARAUDER HVAC PROBLEMS

Blakshukvw said:
What if you start your car to warm it up in the morning and the eat is set to auto but when you cine back out 20 minutes later it's stone cold in your car and the climate control had done nothing. Seems there has to be an AAT sensor inside the eatc to determine the temp inside and too tell it what to do. Maybe it's bad? Anyone experienced this?
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Run the EATC self-test.

There are a couple of sensors, one on the top of the dash & one next to the EATC.
 
My AC Trouble, Help Needed

First off I just had the compressor the condenser the coolant O rings and one other item (expansion valve maybe). My compressor blew a hole out of it! The worse thing is the clutch squealed like crazy so I bypassed it (that was a trick using an 81.5" belt worked perfect!) My friend who is a mechanic at Ford dealer did the work and this is what I am experiencing:


1. For the first 30-50 minutes or miles the AC blows very cold out mostly of the dash (yes when on the throttle it blows out of the defrost vents). Russ fixed my EATC with silicone o rings last year at Carlisle but it never worked just right.


2. Then after the initial time the AC keeps blowing but the air doesn't come out of anywhere! I hear it blowing like crazy, the car drips water from the evaporator like normal but the temp in the car goes up. Driving through Atlanta today in HEAVY traffic at 12:30 PM was about 110 degrees in the car with the window open!


3. When the car sits for more than an hour it begins to work again for the same 30-50 minutes or miles. My 1992 Crown Vic with the old style R12 AC system with 160K miles still blows cold all of the time.


4. Now my EATC: I do the self test and it does work (it does stop when I press Floor and Off and then within 2 secs press Automatic and all it does is go back to Automatic (but no AC out of anywhere just blowing like crazy behind the dash).


Your ideas and suggestions ar5e greatly appreciated. Wish I had a Silver Birch Marauder after this near 2,000 mile trip to PA! Thanks for the help.


Dave
 
The AC coil inside the car is freezing solid. I tried a similar trick many years ago in an old Nissan but I had to put a toggle switch let the compressor go off and the core to thaw out. If you let the system run too long with the compressor locked on you will turn your AC coil in the car into a brick temporarily, so that's why it takes a while to thaw out.

Sent from my SM-N950U using Tapatalk
 
fastblackmerc said:
Most likely it is the Blower Control Module (BCM). Tap the BCM (under the hood, behind the passenger side cam cover). If tapping the BCM makes the blower work correctly, the BCM needs to be replaced.
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Thanks for the tip. You saved me a lot of time digging into the HVAC workings. My blower was intermittent a couple months ago, seemed to stabilise as functional, then about two weeks ago it went off and stayed off. One moderate tap on the BCM with a plastic hammer and it's back for however long it lasts. If it does not want to remain on, I know where part of my bonus is going.
 
Amethyst said:
Thanks for the tip. You saved me a lot of time digging into the HVAC workings. My blower was intermittent a couple months ago, seemed to stabilise as functional, then about two weeks ago it went off and stayed off. One moderate tap on the BCM with a plastic hammer and it's back for however long it lasts. If it does not want to remain on, I know where part of my bonus is going.
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I can fix your BCM.
 
I wish to buy a new BCM from you with your solder changes. I will ask MOs Speed Shop to install it. Please share the cost.
 
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