There is definitley a vacuum leak..more info coming...
Check the vaccuum at the rear of the motor that runs thru the firewall...you may have to remove the lower dash to get to the heater control valve..I will see if I can find you a picture...in mean time take look at "my Tips" section for heating troubles.
http://www.supermotors.net/clubs/superfo...
here is a great vacuum diagram to trace vacuum lines.
Larry there is a vacuum line that controls the heater control valve that allows the hot water to the heater core..it may have a bad vacuum line that controls the opening and closing of the flapper inside the heater control valve..you may not know the flapper is bad because it is not visible from the outside.
https://www.fleet.ford.com/default.asp
you can register for free here and troubleshoot your car
universal will work okay!
atc_diagram_84_87.jpg is the drawing you should use
! thing to check if vacuum is okay..make sure that the damper door is opening and closing properly...this converts the air from cool to hot..this is located inside the duct work..requires dash removal....there are several doors inside this duct work...your car is electrical and vacuum controlled both.....the switch that you replaced should control the damper door but check to see if you can hear it opening and closing..if not visibly check it...alot of work involved...cheaper to fix yourself if you have the time to take dash out.
Heater control valve for your car
Acdelco 15-5832 Heater Water Valve
1985 Ford LTD Crown Victoria 5.0l
Your heater control valve is electric so that eliminates the vacuum there..so you have vacuum that controls the most likely controls the damper door that is in the air duct under the dash...fluctuation in air is definitely vacuum so stick with it......check all vacuum lines per that drawing and you will get it fixed..just be patient..YOU can fix this yourself, I did mine..don't need a mechanic to charge ya arm and leg...ill look for red vacuum line for ya and yes problem may be internal...inside the duct... there should be 2 vacuum lines that go to the damper door control valve inside the duct
look at drawing ..red goes to the partial panel door
http://www.supermotors.net/clubs/superfo...
look for red line
hose color red..... controls floor vacuum
yes ford calls it differently...but if you look it up online it is listed as a heater control valve...
yep...50 cent part and a weeks worth of time..lol..took me that ling too...pain n rear...but you will fix it...!!!!!!!!!!!!
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Ok, thanks!
Thank you!
Are Heat/AC check valves car specific? I installed a universal fit NAPA brand.
Ok, I've got water in both heater hoses, and to the core. The heater box is HOT regardlesss of what the car is doing (idle/acceleration). The heat only comes out of the vents hot under acceleration, and goes tepid, barely luke warm under decelerationSo what are you saying? The problem may be internal ie: inside the heater box?
I did just find a vacuum line with a screw in the end of it, but I can't find where it goes/went. It has a red stripe on it.
The mystery vacuum line is under the hood at the firewall, and it is curved back towards the firewall, but after 30 minutes of looking, I've not a clue whaere it's supposed to go
That pic of the heater control valve that you posted is the first part that I installed, except Ford called it a "Thermo lockout switch"
Well, it's getting dark now, so it's time to put my toys away. I'm thinking that unplugged vacuum line under the hood is somehow related to the map sensor, at least, according to the vacuum line schematic on the fan shroud it appears to be. I'm willing to bet that the problem and the fix is so simple that it's going to take a 50 cent part, and a week's paycheck to fix it. That's usually the way it goes
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