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Sedans Ford Crown Victoria/Mercury Grand Marquis Ford Crown Victoria/Mercury Grand Marquis: Climate Control
35 messages, Last post on Jul 04, 2009 at 4:08 PM
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I have read thru another post in this forum about heater and a/c blower motors that stopped working suddenly. I have a similar problem with a 2003 Mercury Grand Marquis LSE with climate control (Electronic Automatic Temperature Control or EATC for short). I have checked the obvious including the inside passenger compartment fuses plus the power distribution box underneath the front hood with particular attention to both the blower motor relay and blower motor fuses. I even swapped them out with other working relay and fuses in the power distribution box. I then measured the voltage being applied to the blower motor itself under the hood. It read anywhere from 1 to 6 DC volts or so. I have a similar blower motor layout in a well maintained 1997 Ford Crown Victoria (without EATC) and that voltage reading was 13-14 volts whether the fan speed control was set on low or high. So I'm suspicious of the lower voltage I measured in my Grand Marquis versus my Crown Vic... why would there be this big difference? While traveling down the highway yesterday at 50-60 mph with the a/c set to 70 degrees, I could feel cool air coming from the vents in my 2003 Grand Marquis probably because of some of the air being recirculated from the outside to the inside. The faster I went, the more cool air I could feel coming from the vents BUT still the blower motor wasn't working. So the A/C system is working, it just ain't blowing this cool air around the inside of my car! I read about a EATC module self test today at: http://www.p71interceptor.com/eatcswap/selftest.html which I performed with NO Diagnostic Trouble Codes (DTC) indicated. I then disassembled the fan speed control switch, cleaned it with a cotton swab and some rubbing alcohol, reassembled everything but still the same result... the heater and a/c is not blowing any warm or cold air whatsoever. What else am I overlooking?
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Replying to: ascorbate (May 25, 2007 11:35 am) Let me tell you though that this was an absolutely "miserable" module to replace. It is under the hood sandwiched below the two heater hoses and underneath the vapor mangement valve and secured with two 8 mm screws. What should have been a 10 minute job turned into a 2-3 hour miserable job thanks (once again) to the forward-thinking engineers at Ford Motor Company. I don't know what those automotive engineers were smoking but it must have been damn good! I did read somewhere that if this blower speed controller needed replacement, that something else (like the blower motor itself) may have been the real culprit. Anyone else have any opinions about this?
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| I smell gasoline when running the ac. Has anyone else had this problem and what can be done? | |
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Replying to: ascorbate (May 26, 2007 12:56 pm) I paid $150 to get mine fixed by my local Mom and Pop garage. One advantage of the Grand Marquis is everyone knows how to work on it, so don't overpay for a dealer to fix it. One suggestion is to find the garage your local police uses for repairs - they will know the car inside and out. |
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Replying to: mr5x5 (Mar 21, 2007 1:14 pm) Thanks Al Malone
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My EATC(automatic Climate Control) is loosing vacuum. I checked the system, all doors function and do not loose vacuum, supply holds vacuum even post car being off, so storage canister is fine, no leaks in connection. What is left? EATC Symptoms are that air is coming from vent but changes to def/floor or will just come from def/floor. The only reason I can see after checking everything is that the solenoids in the EATC that regulate the vacuum to the different doors are not getting enough current. This in turn allows the opening to the outside air to open when the solenoid is activated and therefore loosing vacuum in that part of the system. Does anybody know how to fix this, short of replacing the EATC and does anybody have an electric schematic of the EATC?
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| OKAY I AM NOT THE SMARTEST PERSON IN THE WORLD, BUT EVEN I SHOULD BE ABLE TO FIND THE A/C DRIP LINE. BUT FOR WHATEVER REASON I CAN NOT FIND IT. MY A/C IS NOT DRIPPING AND I CAN HEAR WATER ROLLING AROUND IN MY DASH. I HAVE MY CAR UP ON JACKSTANDS RIGHT NOW BUT I STILL CAN NOT FIND IT. PLEASE HELP............... | |
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Replying to: mr5x5 (Mar 21, 2007 1:14 pm) Mr5x5, I've had the exact same problem in my 2001 GM LSE. Last year Feb. I had the blend door actuator replaced. I'm thinking that perhaps the mechanic bumped or somehow caused the Controller Board to have a solder crack. Until then, the blower worked fine. A short time after the repair I noticed that the blower was intermittent. My blower stopped completely last week. I could not find anything on line to explain this until I read your post. Can you explain where I find the "Controller Board" to check it out. Naturally with the LSE it has the center consul making everything a bit harder to access under the dash. It sounds like it needs to be inside the heater/AC box to maintain the right temperature so it doesn't burn out. I'd sure appreciate any advise you can give me. Thanks, Sweating it out in Phoenix Az. Whew!!! KeatsArizona 
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Replying to: mr5x5 (Mar 21, 2007 1:14 pm) |
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