need heat on 1990 Ford E-150

how do i replace my heater core in my 1990 ford E150 conversion van 5.0 mustang motor it has 107,458 oringal miles and also when i turn right it is very hard but when i turn left it is easy any idea

Asked by for the 1990 Ford E-150
Thankfully, there is an access cover under the passenger side of the dash that allows you to remove just the heater core without pulling the dash.

You may have a steering gear issue or pump issue causing the steering difficulty. Have the steering pump tested.
I understand that there are 2 rubber hose connections thru the firewall that you should cut from the engine side for easier removal. Is this true? I can clearly see the heater box under the dash on the passenger side, but will I also have to remove the engine doghouse for any easier access?
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