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.
About $600
From $300.00 to about $500.00
About 90 dollars if you do it yourself.
About £5000 About £5000
Around $500. $450 in labor and the heater core is about $50. PITA job!
The heater core itself, should be under $50. Installation aprox $300 to $400.
Probably around $400. I had a radiator replaced for that much so I think a heater core would be maybe a bit less.
49.99 to 69.99 where I work!
How much will it cost me to replace the heater core in my 1999 Mercury
Seldom is a heater core repairable. Replace the heater core with a new one.
About 27.00 for a 1988 towncar heater core at autozone.
$400 to $500 or more if the vehicle has AC, would be my guess.