Any Ideas 98 Taurus no heat?

[3GTS]

A friend of mine has a 98 Taurus that has no heat at all. He already replaced the thermostat. Any other idea?
Thanks

[ChrisPerry]

whats the temp gauge do? i've seen them rot out heater tubes to the heater core from the engine. ive seem them eat heater cores for breakfast.

need more info.

[3GTS]

The temp sets about halfway maybe a little less. All the metal tubes and hoses seem fine. I looked around the floorboard for wet spots, but its all dry.

[ChrisPerry]

its probably plugged.

[tonysilver82]

Remove both hoses from heater core and back flush it

[Andfab99]

I have a friend that has to back flush the heater core on his 99 Taurus every couple of years. You will be surprised how much crap comes out of the heater core.

[83GTRAG]

Got Antifreeze?

[jbiermann]

Ugh I changed the heater core in the wife's 2000 Taurus and it was big pain. I would also check to make sure the blend door is operating correctly.

[kubitzford]

my guess is mice plugged the flapper door that changes the sir from outside air to pushing air through the heater core.

[3GTS]

seems the most common problem is the blend door. Ill get him to try that first anyway, Thanks for all the resonse

[gr79]

Are both hoses to the heater core hot when engine is warmed up?

[3GTS]

they are both hot

[sideshow]

there is a blend door that warps in the heater plenum and wont blow hot.

[sideshow]

Here is the Ford Technical service message

TSB 02-23-6 CLIMATE CONTROL - ERRATIC OPERATION OF THE COOL/WARM FUNCTION OF THE TEMPERATURE CONTROL SYSTEM - REPAIR PROCEDURE FOR STRATIFICATION (SECONDARY) TEMPERATURE BLEND DOOR