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.
Disconnect the heater hose off the heater core on the firewall and remove the inside middle side panels along with the lower heater core panel and pull the core straight out.........
see the answer for how do you replace heater core 96 jetta its the same good luck and god speed
The dash must be completely removed in order to gain access to the heater box. Then the heater hoses are disconnected and the heater box is removed and opened up. That gains access to the heater core for relacement.
If you contact me at ryanboelter@yahoo.com, i can send a detailed set of instructions.
If you look from the engine compartment you will see the 2 heater hoses that connect to your heater core at the firewall towards the passenger side
Thermostat and/or heater core may be defective
Check the heater core, it is probably bad. It could be heater hose connections to the heater core, but I would bet on the heater core going bad.
The heater core can be found behind the passenger side kick plate. Remove the water supply hoses from your 1996 Chevy Impala heater core. Remove the heater core retaining bolts. Reverse the process to install the new heater core.
HI I am about to do a core in my newly acquired 96 grand am Ill let you know next week It may be an hour job or an eight hour job
the heater core was stopped up just flushed it out ok now
Easy to replace. Hard to get to.
Subaru leg out back 96 97