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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.
What else can I help you with?
Heater box removal 1999 Chevy blazer?
Open the two front doors and remove everything from the front seat to the firewall, I'm not kidding.
How do you remove the box that the heater core is in for a ford f150?
you must first remove the glove box,then you will be able to get at the screws that hold the box in place
Why does your heat not work in your 1999 Chevy silvealdo?
Low coolant level, thermostat stuck shut, heater core plugged up, doors not opening in the inside air box, door not opening outside air box. Start with these first.
Where is heater control valve located on 1992 ford F150?
Inline in one heater hose underhood near the HVAC box (right hand side underhood.)
Where is the Windsheild wiper fuse for 1999 F150 located?
Its in the fuse box under the stearing wheel.
How do you change heater core in 1999 ford f 150?
heater core is in back of the glove box
How do you change a heater core in a 98 f150?
The truck dash panel has to be removed along with the steering wheel and steering column to access the plenum box. The plenum box then has to be removed to get to the heater core. This requires evacuating the AC system, draining the radiator, disconnecting all lines and removing the box. Replacing the heater core is simple when you get to this point. If the problem is lack of heat(not a physical leak), the problem is more likely with the blend doors on the F150. This is a very common fail mode. HeaterTreater has a line of products to address the issue at a low cost. Follow my user name to my Bio Page for more information. ford4me
Where is the heater plenum in a 1999 ford explorer?
Heater plenum is the same as the heater box and it spans the width of the passenger side dash behind the glove box. Check heatertreater.net for pictures.
How do I access the heater blower in a 1999 escort?
It is on the passenger side of the vehicle. It is below the glove box and to the left of the kick panel. It is underneath the heater box. It is easy to get out.
How do you change the heater core in a 2000 F150 4.6L?
remove glove box. remove platic cover behind glove box under hood remove both heater hoses at firewall under dash remove retaining screws on heater core remove heater core reinstall is exact opposite of removal
Where is the heater control valve on a 1998 ford expedition with a 4.6L engine?
Heat control is by air flow control doors in the a/c and heater box. There is no water valve.
Always blowing hot air through the vents?
Doors in the kick panels or heater box are not closing to redirect the air.
