i have a 03 f150 4.6L.. when i use the heater it blows out a mist that fills the truck and it smells like coolant.. heater core?

thank you =]

 

Yes, heater core is leaking.

 

thank you thank you

 

now that thats in progress lol... the blower only works on high.. is that a bad resistor or control switch?

 

Typically, that is a burned-out resistor.
The fan will only run on 'High' when the resistor is burned-out.
The resistor is used to obtain lower fan speeds.

 

It's nice and easy to get to the resistor while you have the whole dash out of the way to change the heater core....

 

It's pretty easy even with the dash in place.

 

There is a short cut video on u=tube for replacing the heater core. There is an installation bracket used by the assembly workers at FORD to lift the dash in with an arm. Supposedly this bracket is useless after the dash is in. The guy in the video cuts through it giving you enough room ro wiggle the core out. It's been a while since i've seen the video, Ithink he stills loosens the dash but he doesn't have to remove it. He says it saves a lot of time.
Good Luck and Happy Wrenchin'

99 F-150 4x4, 4.6, std cab, long box LT 245/75/16

 

heater core and resistor replaced =].... but... now when the heat is on the a/c runs constantly and it blows cool air after its been runnin about 10 min????

 

Sounds like a blend door issue. When you change it to 'hot', the blend door isn't moving...Could be that you didn't install it correctly after replacing the heater core or the actuator could be bad. Were all the electrical connections plugged back in at the acuator?

I do know with these Fords that when the coolant is drained and then re-filled, sometimes it takes a bit for the air to escape and coolant pass through the core. That's what the dealership told me when I had to drain the coolant to replace my engine oil cooler. When I put it back together, the heater didn't work. After running the engine for a while (upwards of 15-20 minutes), it started working fine and has done so ever since. How long did you run it after the core was replaced? (with heater on high)

 

heat works, it gets really hot for about 5-10 min but the a/c compresser runs constantly and makes it just hardly warm

 

and it only does that when its on panal and heat, not when its on floor