A big task to replace..get new blowermotor n ac evap at sametime to cut cost if u want to keepcar. Find an xperiencd independent shop
SOURCE: Heater core 1990 Ford F-150
I believe this is the easiest heater core ever invented. If it is like the 1986 model. I believe it is. You take out the glove box door. The heater core is right there under a cover in the duct work.
SOURCE: how do you take out the heater core in a 1990 thunderbird?
disconeck heater hoses under the hood on right side of motor and then inside car under dash remove the heater box on right and the core is inside,4-5 hour job.
SOURCE: 95 dodge dakota heater blower not working
It has been a long time since I've replaced one of those. From what I remember you don't have to go through pulling the heater box out. You do need to remove the glove box assembly. Look up under the passenger side of the dash. If you see the bulge of the motor/cover hanging straight down then remove the cover and the motor will be there. If you don't see that then te motor is mounted horizonally. If that is the case then the fresh air door assembly will need to be removed and it is behind that.
Here is a quick check to see if the motor is bad. Thump the bottom of the heater box by the passenger's feet. if the motor comes alive or makes noise then it is bad. Also check the fuse and make sure that it doesn't work on any speed. (the resistor would prevent operation on only one speed or more but generally not all speeds)
SOURCE: heater core replacement info for 1990 F150 truck
luckily most ford trucks are rather straigh forward. remove lines in the motor bay. remove glove box. you will see a cover with a lot of small bolts.remove and gently pry off. this should expose the core.it in turn pulls out.reverse dirictions for install
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