if you pull the controls out a bit (take the bezel off and unbolt the controls from the dash) you'll see a mass of vacuum lines coming out of one part. the back end of said part has some electrical connectors. That part is the brain. Typical parts places call it the "blend door lever actuator" or some such crap. The vent selector switch arm slots into the side of this part to control the vacuum. I think 90+ is a little different from my 88, the difference being the electric blend door actuator instead of the vacuum actuated blend door. Getting that part off of the controls can be a test of patience and hand contorting though... aka PITA! but it can be done.
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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)
Originally posted by gadget73
... and it should all work like magic and unicorns and stuff.
Originally posted by dmccaig
Overhead, some poor bastards are flying in airplanes. -
Okay, here's a reply:
After pulling apart some of the dash, here's what I see:
Like slymer was saying, here's my blend door lever actuator (first pic), attached to the "brain" (second pic). Part numbers, in that order, are F0VH-19D961-AA and F0VH-19D840-AA.
I'm suspicious of this third part: following 2 pics. It seems to be a cabin air temperature sensor, but I'm not sure. It sits right above the clock, and a hole in the dash goes to it. Anyone know what this is? If it is a temp sensor, I'm thinking this could be part of my problems. Part # is F0VH-19C734.
This still doesn't explain the fan speed, but I'm thinking of just replacing everything. I can't find the brain and the sensor anywhere though. Rock Auto has the blend door lever actuator. Guess I gotta hit the junk yards, etc.1990 LTD Crown Victoria LX. As stock as the day it was born.
16" HPPs sitting in the garage. That's it for now...kids gotta eat.
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Update: I think I just found the sensor on eBay. It's a "Ambient Air Temp Sensor." Score!1990 LTD Crown Victoria LX. As stock as the day it was born.
16" HPPs sitting in the garage. That's it for now...kids gotta eat.
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That looks like the cabin air temp sensor to me.~David~
My 1987 Crown Victoria Coupe: The Brown Blob
My 2004 Mercedes Benz E320:The Benz
Originally posted by ootdega
My life is a long series of "nevermind" and "I guess not."
Originally posted by DerekTheGreat
But, that's just coming from me, this site's biggest pessimist. Best of luck
Originally posted by gadget73
my car starts and it has AC. Yours doesn't start and it has no AC. Seems obvious to me.
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Yup, that's what it is. I'm starting to think now that the problem is both that and the controls themselves. It seems to be stuck in auto mode, blowing full speed all the time, either all cold or all hot. I'm prolly just gonna replace all 3 things if I can find them...Originally posted by 87gtVIC View Post1990 LTD Crown Victoria LX. As stock as the day it was born.
16" HPPs sitting in the garage. That's it for now...kids gotta eat.
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the lever actuator IS the brain in mine at least. The face is just levers and switches. I don't have the black box on top. I also don't have the graduated fan speed control. This makes me think that it may all be the fan speed switch in the face there in combination with the cabin temp sensor and/or the brain on top. the temp sensor in my car has the cable from the temp lever connected to it. Looks like yours is all electric with the only mechanical part being the vent lever that actuated the "blend door lever actuator" to control the vents via the vacuum. You definitely have an electrical gremlin in all of that mess.
Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)
Originally posted by gadget73
... and it should all work like magic and unicorns and stuff.
Originally posted by dmccaig
Overhead, some poor bastards are flying in airplanes.Comment
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Hmmm, interesting what is different in yours. Yeah, my controls have some extra junk bolted to the top. Another variable in all this is the blower motor speed control (a transistor on a circuit board, not a bunch of resistors like the manual version) which I replaced about 3 months ago. The speed control is fine, it's the wiring I'm worried about. I had cut all the wires and spliced & soldered 'em all back in. Not 100% confident that all that mess is good. For now I'm gonna replace the controls, actuator, and cabin temp sensor and see where that gets me. I'll post the results.1990 LTD Crown Victoria LX. As stock as the day it was born.
16" HPPs sitting in the garage. That's it for now...kids gotta eat.
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is the sensor all clogged up with dust? Sometimes that happens on the Mark VII and the EATC gets all batshit like that. If that plastic tube is unhooked or clogged up with stuff it also makes the system not act right.86 Lincoln Town Car (Galactica).
5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley
91 Lincoln Mark VII LSC grandpa spec white and cranberry
1984 Lincoln Continental TurboDiesel - rolls coal
Originally posted by phayzer5
I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers
Everything looks like voodoo if you don't understand how it worksComment
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No, the sensor itself is fine, but I haven't pulled the hose off yet. I'll have to do that. The replacement was only $10 on eBay, so that was a no brainer...Originally posted by gadget73 View Post1990 LTD Crown Victoria LX. As stock as the day it was born.
16" HPPs sitting in the garage. That's it for now...kids gotta eat.
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Alright, here's the update. I replaced both the sensor and the blend door actuator with brand new parts. No luck. Same symptoms: all cold air and full speed fan, with the occasional period of time where things work as they should. I guess next up to try are the controls themselves. Another weird thing in all of this is the behavior on start-up: when the system comes on, the fan slowly builds speed until it's at about 95% of full speed. It stays there for about 3-4 seconds, then you hear a very soft "click" from somewhere in the dash, and it goes to 100%. Same thing every time. This is starting to suck.1990 LTD Crown Victoria LX. As stock as the day it was born.
16" HPPs sitting in the garage. That's it for now...kids gotta eat.
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Success! It was the "brain" sitting on top of the controls, the flat, electronics bolted on top of the sliders, with the fan speed slider attached. Rock Auto has it listed under "Blower control switch." My original Ford part # is F0VH-I9D840-AA. I wound up buying a $70 used one on eBay instead of the $140+ options on Rock Auto. Turns out I probably didn't need the blend door actuator, and definitely didn't need the cabin air temp sensor, but it never hurts to have 'em. I got everything hooked up and back together, and I have heat and the fan blows at the setting I put it on. REJOICE!1990 LTD Crown Victoria LX. As stock as the day it was born.
16" HPPs sitting in the garage. That's it for now...kids gotta eat.
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Good work. Love it when a problem is solved~David~
My 1987 Crown Victoria Coupe: The Brown Blob
My 2004 Mercedes Benz E320:The Benz
Originally posted by ootdega
My life is a long series of "nevermind" and "I guess not."
Originally posted by DerekTheGreat
But, that's just coming from me, this site's biggest pessimist. Best of luck
Originally posted by gadget73
my car starts and it has AC. Yours doesn't start and it has no AC. Seems obvious to me.
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Cool. Now if you're so inclined, would you feel like opening up the dead part to see what happened? I'm just curious if anything is smoked, or if its a cracked solder joint or something else that may be fixable.86 Lincoln Town Car (Galactica).
5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley
91 Lincoln Mark VII LSC grandpa spec white and cranberry
1984 Lincoln Continental TurboDiesel - rolls coal
Originally posted by phayzer5
I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers
Everything looks like voodoo if you don't understand how it worksComment
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Yes, I'm planning on doing that. It was late when I finished up, and forgot to even check. Silly actually, because the cover just pops off, and I didn't even look it over. I was in a hurry to get everything in the car and test it out, then subsequently forgot...Originally posted by gadget73 View Post1990 LTD Crown Victoria LX. As stock as the day it was born.
16" HPPs sitting in the garage. That's it for now...kids gotta eat.
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Well, just pulled it apart and gave the circuit board a very close inspection. Everything is fine. Nothing burnt, no burnt smell, no bad caps, nothing. Everything seems fine. Obviously it wasn't, but you can't tell by looking.1990 LTD Crown Victoria LX. As stock as the day it was born.
16" HPPs sitting in the garage. That's it for now...kids gotta eat.
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