I just spent my whole day with the same problem and it looks as if alot of other people have too. You need to replace the control valve. Take your glove box out, then take your center console peice out. Then you have to take the passenger side plastic off. This is the peice that surrounds the glove box. Once you have done this if you look underneath the dash towards the center console you will see a little box with an arm on it that goes down to an aluminium hose. That little box with the arm is the control valve.
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There are several cause: wheel alignment, ball joint, wear out wheel. You have to check it, this ball joint must not wig to much and if wig then replace it life spam of this joint only 5 years or 4 years old,
first check temp gauge on dash is it normal if so termostat is fine than check the heater hoses going inside from engine compartment if they are hot rule out control valve if it in the engine compartment sit in the vehicle and listen for any noise when you move heater temp switch from cold to hot if you hear clicking noises and no change it may be blend door accutator with moves when you slide or turn heat control nob the heater may have to be removed on some models eexpensive repair may be needed
is an electric motor that turns heater core on and off. It's located
under the dash to the left of the glove box. Some disassembly required.
The part will cost about $120 to $180. part number is #MR958603. I saved money by
purchasing it on line. It is a stocking part at most Mitsubishi dealers.
Once you pull the glove box out and remove the bottom half of the dash
all the way across, you should be able to gain access to the motor to replace it. Caution:
if you do not put everything back in correctly and tie/tape it all back
down carefully in the correct places you will have lots of under the dash noises when you are done.
The clicking noise you are hearing is the temp door actuator. It is located in the center of the dash. If you look behind the radio from the Passenger side of the van you will see a white square box with a black or green connector in it. Remove the connector and then remove screws that hold the actuator in place. Install a new actuator and reconnect the wire connector. This should take care of your problem and your heater will be fixed. I hope this was helpful.
it is the heater control valve that is located next to your glove box the control valve has a motor atached to it take your glove box out and the lower part of the dash
then you can get to the part to replace it (Dealer item only ) around $150.00