Did this job to my 99 TC a couple of years ago; still have the scars to show for it (literally)! It is a royal pain in the ass!! But with the book rate @ 16+ hrs (been a couple years, but as I remember it's @ least 14), & shop rate $70+, I figured I could save a grand! The part's about $40, I joined Aldata to get the shop manual information, and 3 days later I had it back together! The job requires (if done correctly-I tried to skip steps-don't!) that you remove the drivers seat (so that you can lift the carpet out to remove the rear vent assembly (I skipped this-don't), the steering column, the dash, the windshield wiper assembly, the cowling assembly [seal this well on reasembly-Town Cars are known for leaks here; if you have unexplained wet carpet on the passenger side (front or rear), it's probably from that!], then you can get to the bolts to remove the plenum & disassemble it to remove the heater core! Then reverse the proceedure! There is extremely sharp metal exposed when the dash is removed, that's where the 'scars' are from! My rear vent doesn't work because I skipped taking out the drivers seat & had to break part of the vent assembly to get the dash out, & it rattles a bit! But the heater works & the car doesn't smell like anti-freeze! I can laugh about it now, and I'd probably take it on again! I don't know about you but I can't afford an extra grand in this economy!!! X
on my 1985 Lincoln town car i had to remove the dash and get back to the firewall and remove a panel on the firewall to get to it. good luck it is a pain.
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Well You have To Remove The Whole Dash Bord To Get To The Heater Core It Sits Inside Your Car In Behind The Glove Box And Wires
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According to the 1999 Lincoln Town Car owners manual : ( 5W-30 )
Disconnect batt. Drain Raidiator coolant.Remove Dashboard. Unhook both heater hoses located on firewall in engine compartment. remove airbox nuts in engine compartment. remove retaining screw for core in cabin. remove core.
the a/c has to be evacuated,evaporater case has to be removed to gain access to a few bolts.then you remove the dash from the car,to gain access to the heater plenum.this is probably a job for your local for lincoln/mercury dealership.