Along with my F150, I have a 1997 Taurus, 3.0, 75,000 miles

The heat is intermitant, sometimes it is weak and take awhile to operate to get that little bit. At about 25,000 miles the heater coil was replaced. The cooling seems to be ok. What could cause this?

Thanks

 

Low water level in your system or a plugged line/core. How's the temp guage look?

 

More than likely, the cooling system has turned into a muddy looking sludge. Kinda like the 4.2s and their intake problems, this is another deal Ford tried to keep under it's hat. Depending on when the car was built and what year it was, you're supposed to install a bypass kit that aids in coolant flow throughout the block to minimize corrosion and flush the cooling system (block, radiator, heater core) several times with clean water, refill and hope for the best.

 

Sticky thermostat??

 

All those aside, check your blend door motor. Its a little piece of crap electronic motor that changed the air from cold to warm to hot. It is a common failure in these vehicles, and yours could simply be on the fritz. A real good way to check would be to let the car get to OT, and then feel both of your heater core hoses. If there are both realtively hot, then thats not your problem (if one isn't hot and the other is, it is the heater core) I just dealt with this kinda problem from a cherokee. I'm gonna post you a few diagrams, and show you what to check if the core checks good.

 

1) Disconnect Battery ground



2) Disengage console panel from instrument panel reinforcement and remove from instrument panel.



3) Disengage console panel from RH side of center console finish panel if equipped.



4) Working from under the passenger side of the instrument panel, remove A/C electronic blend door actuator electrical connector from A/C electronic blend door actuator.

5) Remove four screws retaining A/C electronic blend door actuator to the A/C evaporator housing and remove A/C electronic blend door actuator from A/C air temperature control door.

 

Let me know if you need diagrams of something else

 

Thanks for all the assistance. The coolant was changed not long ago and did not see any kind of problem. Heater coil was replaced at about 24,000 miles. I'll look into this a little further and see what I can find. I'll let you guys know.

Thanks