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A sticking thermostat will cause this .
This sounds more like the common blend door problem on this model. The plastic door is driven by a DC motor that is geared too strong for the application. Over time the motor will overstress the door and break the connector. The same plenum box is used on the F150 and you can find information on the problem by searching for that model also. There is a video available on YouTube showing how to diagnose and repair the system. It is an expensive repair at the dealer, but you can repair it yourself with minimal skills. You can follow links on my bio page for pictures and additional information on how to diagnose and repair the problem.
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Your heater fan only works on your 1997 tiburon sometimes any ideas?
it is either a bad switch on your controls, or your blower motor is going out
How come my heater on my Ford Fiesta 1998 only works on number 4?
how is it my heater control on my ford fiesta flight 1998 only works on no. 4
Ford Expedition Signal only works sometimes?
Check owner's manual. If you don't have one copy and paste link below; www.fleet.ford.com/maintenance/owners_manuals
Heater only works on high speed?
The heater motor speed resister is burned out.
97 f250 heater only works on high is this a problem with the heater resisitor block?
Possibly
The a-c on our 1998 dodge ram van sometimes blows through the dash vents and sometimes through the heater vents that blow on your feet What is the problem?
Sounds like you have the beginnings of an a/c vacuum leak. Our Expedition did the same thing and eventually it defaulted to blowing out of only the heater vents, which is the default when things aren't routing properly.
If the rear heater works ok why does the front heater only blow cold air?
replace front heater corefront and rear have independent heater cores
Heater motor only works on high 2002 dodge caravan 95000miles?
Replace heater motor resistor.
Vectra heater fan only works on full?
Probably the Heater Fan Thermostat. It may have a different name.
Heater only works on high?
The blower motor speed resistor is burned out.
2001 dodge 1500 ac and heater flow regulator switch does not work. works only on defrost?
2001 dodge ram 1500 ac and heater flow regulator switch does not work. works only on defrost. How to fix?
How does gas heater work?
The gas water heater works through a principle of physics which is known as convection. The gas heater is similar to a water heater only that it has one heating unit.?æ
