The Heater core is difficult to replace on the F150 since it is buried in the plenum box. Getting to the core involves removing the steering wheel, steering column, complete dash panel, evacuating the AC, draining the radiator, and finally removing the heater box. Once you have the box out(8-12hrs), the core is simple to replace.
You want to be sure that the core is the problem before you undertake this process. If there is a strong smell of antifreeze in the cab or a puddle of coolant on the floor, the diagnosis is easy.
Check that the radiator is full, not the overflow tank, the radiator. On a cold engine you can remove the radiator cap and check the level. It should be full. If there is air in the system it will affect cab heating and engine cooling.
Another good check is to feel the two heater hoses going into the firewall from a cold start. The hoses should warm up at about the same rate and get uncomfortably hot-close to radiator temperature.
If the core appears to be OK, the next concern is with the blend door that diverts air through the heater core. This is a common failure on the F150. We have a video posted on our web site that shows how to diagnose and repair the system. Please follow my user name back to my bio page to find a cut-and-paste link to the web site. You are only a few clicks away from solving the problems.
heater core hoses not hot
how do I disable computer on Ford 150 1998
you should be able to get at heater core just by removing glove box.no need to remove all the dash Is there any instructions on how to do this?
How do you replace a heater core in a 1998 ford expedition?"
block heaters are not standard on f150's. Thus if it was ordered with the option, dealer added or aftermarket installed it may have a block heater. Best way to find out if there is a block heater is to look very closely behind the grill and look for a plug that looks like a male end of an extension cord.
How do I locate the heater blend door actuator in a Ford f150 pickup
How do you replace a heater core in a 1998 Ford Expedition?"
The vacuum diagram for a 1998 Ford F150 is located in the service manual. It details how each vacuum line is routed, where the line is attached, and its function.
Ford sucks... i paid for a block heater but ford will not install it after I pointer out that there was not one installed But any thing but a ford..
what is the year model? 1995
Try flushing the coolant system out
Take it 2 a mechanic. :D