Well then...... That's news to me..... April 04, 2019, 11:01:25 AM I was doing a little digging into EATC system operation and came across the following thread.....http://www.foxtbirdcougarforums.com/index.php?topic=39114.msg451153#msg451153I found a post in there that piqued my interest considerably. Here it is....Quote from: TurboCoupe50 – on September 08, 2015, 10:34:24 AMQuote from: My10-80;451112would it make a difference that I can still manually adjust the speed?Ummmm, I dunno I'd suspect the controller I mentioned is OK if manual adj works...May want to check EATC temp sensor mounted at heater core hose connector... It prevents blower from operating on automatic when engine is cold, then goes to full on once temp starts to rise... It's one of the things that pissed me off about the EATC system, as air was never warm enough when high speed activated(and part of reason why I specifically sought out my TC with a manual HVAC system)... Then you are talking about A/C, so again I dunno...BTW there is also a cabin ambient temp sensor that plays a large roll in operation, it's mounted in dash above the Graphic EQ/storage well...I'm sorry..... WHAT? A cabin temp sensor?!!!!????? I never knew about this let alone noticed it when I've been messing about in that area.... Someone please educate me on it. Quote Selected
Re: Well then...... That's news to me..... Reply #1 – April 06, 2019, 12:23:00 AM Well it's there. I've seen it when the radio surround trim is off. I haven't tried to remove it but the thing works, which is all that matters to me. Quote Selected
Re: Well then...... That's news to me..... Reply #2 – April 12, 2019, 08:54:49 AM I'm curious about its operation more than anything else.... Meh. Time to pony up for that shop manual I've been eyeballing anyway.... Quote Selected
Re: Well then...... That's news to me..... Reply #3 – April 12, 2019, 10:29:14 PM According to pages 108-109 of the 1988 EVTM there is an in car temp sensor in the dash as well as an ambient temp sensor in the evap case. So the system has two temperature sensors. Quote Selected
Re: Well then...... That's news to me..... Reply #4 – April 14, 2019, 09:05:44 AM The dash one is what I'm interested in. Quote Selected
Re: Well then...... That's news to me..... Reply #5 – April 18, 2019, 11:23:13 AM News to me also. I just knew about the one monitoring coolant temp to the heater core. Quote Selected
Re: Well then...... That's news to me..... Reply #6 – May 11, 2019, 12:10:02 PM guys,the trim around your radio & ash tray & eatc ,, at the top rolled in area of that piece of trim there is a cut out from the factory.poke your finger into that approx 3/8'' x 1'' opening and you may find the j or k wire type temp sensor leads.on my 20th the sensor is not there,, its on deeper into the innerds of the dash. the factory wire would not reach its intended home.Its used when you set your eatc to Auto,, the eatc will ramp the blower up and down on its own? i did not know about an external temp sensor other than the one on the heater core Quote Selected Last Edit: May 11, 2019, 08:45:33 PM by james cassity
Re: Well then...... That's news to me..... Reply #7 – October 14, 2019, 04:06:07 PM Been busy as heck. Forgot all about this. My shop manuals came in. Time to research this. I'll post when I can. Quote Selected
Re: Well then...... That's news to me..... Reply #8 – December 09, 2019, 08:34:58 PM Please click on the two links. They're pictures. Haven't quite figured out how to insert the actual images from Google Drive on here yet.https://drive.google.com/file/d/19Og6H_pz0fwbPkZmkHo8dYZQOxhOh8hl/view?usp=sharinghttps://drive.google.com/file/d/19PDau6qmuW03rjb6roA6q8oj1_8p-yKl/view?usp=sharingSorry for the long wait. I actually pulled the In-vehicle sensor today and cleaned it. It was quite disgusting.It may even be so bad that it no longer works. I'm looking through the test procedures in the shop manual now. Anyway, whether or not I'll need them does ANYONE actually know the part numbers for these or the Motorcraft numbers? I know they're quite difficult to come by. Quote Selected Last Edit: December 09, 2019, 08:37:29 PM by V8Demon
Re: Well then...... That's news to me..... Reply #9 – December 09, 2019, 10:13:05 PM EATC ATC HVAC A/C Temp Sensor - 1985-1990 Thunderbird, Cougar - Motorcraft YH-434eBay link: https://www.ebay.com/itm/Motorcraft-YH-434-EATC-ATC-HVAC-A-C-Temp-Sensor-1985-1990-Thunderbird-Cougar/184006024335?fits=Make%3AFord&hash=item2ad79d1c8f:g:8a0AAOSwONddsIIp1984 - 1989 Lincoln Mark VII A/C Ambient Air Sensor - E4LY-19E642-AeBay link: https://www.ebay.com/itm/1984-1989-LINCOLN-MARK-VII-A-C-AMBIENT-AIR-SENSOR-ASY-NEW-OLD-STOCK/133131113286?hash=item1eff3b9346:g:puMAAOSwqLFdQwhZ Quote Selected
Re: Well then...... That's news to me..... Reply #10 – December 10, 2019, 11:28:43 AM FWIW, the factory sensor in my car looks just like the one in the eBay link that is listed for the Mark VII. Quote Selected
Re: Well then...... That's news to me..... Reply #11 – December 10, 2019, 07:51:46 PM Man! When I am parting out cars, I've just been throwing those away! I didn't know what they were. Gotta keep 'em now! Quote Selected
Re: Well then...... That's news to me..... Reply #12 – December 11, 2019, 03:26:48 AM Found the following:https://www.thelincolnmarkviiclub.org/phpBB3/viewtopic.php?f=22&t=11677QuoteEATC - Redesigned Replacement Control HeadAIR CONDITIONING - ELECTRONIC AUTOMATIC TEMPERATURE CONTROL (EATC) - SERVICE TIPS FOR REPLACEMENT OFREDESIGNED CONTROL HEAD - VEHICLES BUILT BEFORE 4/21/90FORD:1985-88 THUNDERBIRDLINCOLN-MERCURY: 1984-87 CONTINENTAL1984-90 MARK VII1985-88 COUGARISSUE:The EATC control was redesigned in April, 1990. It has a center mode button labeled "VENT" and requires a new ambient temperaturesensor calibrated to match the new control. Using the wrong sensor will bias the interior temperature 5-10~ F from the set point.ACTION:If an old level EATC control head is replaced with a new level control head, a new ambient temperature sensor (F0LY-19E642-A),identified by a white plastic body, must also be installed.If a vehicle equipped with the old level control head (center button labeled "A/C") requires a new ambient temperature sensor assembly, use(E4LY-19E642-A), identified by a black plastic body.If the (E4LY-19E642-A, black body) sensor is not available, use of the (F0LY-19E642-A, white body) sensor will require installation of a new EATCcontrol head. I cannot confirm anything with regards to accuracy of that yet..... Still hunting for the actual source as the person who posted it didn't cite anyone or anything.*EDIT*Might be from here.....https://www.justanswer.com/ford-lincoln/7yps8-lincoln-mark-vii-lsc-1989-lincoln-mark-lsc.htmlQuoteAnswered in 17 minutes by:8/28/2013Lincoln Mechanic: Don - Mo Lurch.sorry for the delay..............The Ambient Temperature Sender is located Behind Center Of Radiator Grille under hood.There was also a TECH Bulletin for replacing the Electronic Automatic Temperature Control (EATC)The EATC control was redesigned in April, 1990. It has a center mode button labeled "VENT" and requires a new ambient temperature sensor calibrated to match the new control.Using the wrong sensor will bias the interior temperature 5-10~ F from the set point.If a vehicle equipped with the old level control head (center button labeled "A/C") requires a new ambient temperature sensor assembly, use (E4LY-19E642-A), identified by a black plastic body.If the (E4LY-19E642-A, black body) sensor is not available, use of the (F0LY-19E642-A, white body) sensor will require installation of a new EATC control head. Quote Selected Last Edit: December 11, 2019, 03:31:34 AM by V8Demon
Re: Well then...... That's news to me..... Reply #13 – December 11, 2019, 08:40:08 PM Quote from: EricCoolCats – on December 09, 2019, 10:13:05 PMEATC ATC HVAC A/C Temp Sensor - 1985-1990 Thunderbird, Cougar - Motorcraft YH-434eBay link: https://www.ebay.com/itm/Motorcraft-YH-434-EATC-ATC-HVAC-A-C-Temp-Sensor-1985-1990-Thunderbird-Cougar/184006024335?fits=Make%3AFord&hash=item2ad79d1c8f:g:8a0AAOSwONddsIIp1984 - 1989 Lincoln Mark VII A/C Ambient Air Sensor - E4LY-19E642-AeBay link: https://www.ebay.com/itm/1984-1989-LINCOLN-MARK-VII-A-C-AMBIENT-AIR-SENSOR-ASY-NEW-OLD-STOCK/133131113286?hash=item1eff3b9346:g:puMAAOSwqLFdQwhZSo the one for our cars (the black 84-89 one) is just a resistor and some other component. Figure out what they other component is and a rebuild is a simple 5 minute solder job. Quote Selected
Re: Well then...... That's news to me..... Reply #14 – December 12, 2019, 02:56:33 PM Quote from: V8Demon – on December 11, 2019, 03:26:48 AM I cannot confirm anything with regards to accuracy of that yet..... Still hunting for the actual source as the person who posted it didn't cite anyone or anything.That reads very much as if it was taken directly from a Ford TSB page. Quote Selected
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