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1975 Mark Heater Core Replacement

I recently started restoring my 75 Mark IV Blue Diamond Edition. I’ve gone through the entire ignition and fuel system and am about to start the cooling system.
Could you give me some insight as to how hard it is to replace the heater core to prevent future failure? I’ve read manuals and they seem to show a Mark IV with this year as being relatively easily. Many thanks for any help and for operating your wonderful website.
Greetings Steve –
If you are wanting to replace the heater core in your 1975 Mark IV, you will indeed find it relatively easy depending on your skills and if you have the “correct” Shop Manual.
The heater core replacement is shown on page 36-45-11 in the 1975 Manual in the T-bird, Cougar, Montego manual a/c-heat section. The operation which involves splitting the heater plenum under the dash, behind the glove box is described step by step and is followed up with great illustrations. The factory shop manual is a great asset for anyone who is maintaining or restoring a classic car, and we can supply you with them.
We are pleased that you are enjoying the Lincoln Land Blog.

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