2000 Mercury Mystique Heat Does not work

DAVIDANDLIZHALL

MEMBER
2000 MERCURY MYSTIQUE
6 CYL
2WD
AUTOMATIC
144,000 MILES

The blower and the A/C on my 2000 Mystique work fine. I am able to select all modes of the climate system (Def, feet, recycle, etc.) But I do not get any heat, even when the engine is at temperature. Also when I accelerate, there is a wind noise sound from under the dash, in the area of the vent tubes. I have only owned the car since the weather got colder here. Is it possible that the damper door switch has failed with the door in the open/vent position and I am getting outside ambient air? Or could the Auto Temp Control Switch have failed?

Or is there another possability?

1 Reply

BMRFIXIT

MECHANIC
19,053 POSTS

Check coolant level
Is the car reaching operating temp
Check heater core hoses if both are hot,
if both hoses hot and not enough heat inside suspect blend door actuator
if not one hose hot and the other warm or cold the heater core need to be flushed (very common)
as a 1st step
these are the steps
WARNING: NEVER REMOVE THE PRESSURE RELIEF CAP UNDER ANY CONDITIONS WHILE THE ENGINE IS OPERATING. FAILURE TO FOLLOW THESE INSTRUCTIONS COULD RESULT IN DAMAGE TO THE COOLING SYSTEM OR ENGINE AND/OR PERSONAL INJURY. TO AVOID HAVING SCALDING HOT COOLANT OR STEAM BLOW OUT OF THE COOLING SYSTEM OR DEGAS BOTTLE, USE EXTREME CARE WHEN REMOVING THE PRESSURE RELIEF CAP FROM A HOT COOLING SYSTEM OR DEGAS BOTTLE. WAIT UNTIL THE ENGINE HAS COOLED, THEN WRAP A THICK CLOTH AROUND THE PRESSURE RELIEF CAP AND TURN IT SLOWLY UNTIL PRESSURE BEGINS TO RELEASE. STEP BACK WHILE THE PRESSURE IS RELEASED FROM THE COOLING SYSTEM. WHEN CERTAIN ALL PRESSURE HAS BEEN RELEASED, PRESS DOWN ON THE PRESSURE CAP (STILL WITH A CLOTH), TURN AND REMOVE PRESSURE RELIEF CAP.
Engine cool
lower the coolant level
Locate the two hoses running to the heater core
disconnect them at the engine side leaving hoses connected to heater core throw the firewall
use garden water hose and compressed air if possible
run the water and follow by air throw one side and out the other and vice versa
do that two to three times watching what leaving the heater core you are looking for the good flow and clear water to run throw
reconnect hoses
top off coolant system
good luck