What you are seeing is the thermostat opening and closing as the coolant heats up within the system. This, in itself, is normal. However, NORMALLY, you will not see such radically fluctuating temps on the gauge. This problem is usually due to a low coolant level in the system. This results in air being trapped in the system and that is what causes the radical gauge swings. Check the coolant level with the engine cold; fill the coolant and add coolant to the reservoir as needed and recheck.
SOURCE: my heating has gone on my ford focus 1999 no heat hot or cold ?
see owners manual in glove box for fuse location!
SOURCE: Problem:
Problem is most likely in the electronic blend door motor or the door itself has broken.
To access the electronic temperature blend door actuator remove cassette storage box or center shelf unit, if equipped.
Remove instrument panel ash receptacle by depressing service lever. Disconnect electrical harness connector from A/C electronic door actuator motor.
Remove three retaining screws.
Carefully pull A/C electronic door actuator motor outward and off A/C evaporator housing assembly.Make sure the door it self is not cracked where the actuator hooks to it and that it will move.
Here ia a link to a pick of what you are looking at.
http://i253.photobucket.com/albums/hh43/chuck943/L9819A.gif
SOURCE: Ford Windstar SE, 3.8L V6, 1999, front seat heat/defrost is cold
the blendor actuators strip out the gear inside the actuator cases on these all the time. replace the actuator.
SOURCE: Same problem except mine is stuck on HEAT!
If yours is making the clicking sound then you blend door actuator is bad
SOURCE: what can cause my heat not to get hot in my 2000
Feel both your heater hose near the firewall. If one is colder than the other your heater core is bad.
If they are both hot its in the cab controls. Lee
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