2003 Mitsubishi Diamante heater motor wont work checked all leads

if there is an engine warning light there is a electronic sensor fault
if no engine light
check fuel pump its relay or filter first
vacuum
plugs leads coil packs if present

No current, check for unplugged connections

have the heater control motor checked

check that the hot water can flow though the heater core and that the water control (tap) is working

Lots of possible answers to this but it all falls down to this basic rule with witch to always check these problems. You need three things for a motor to run. Fuel, air, and fire find the one it's not getting and you'll know what's wrong. Hope this helps Chris

Symptoms of a damaged heater core is moisture and the odor of coolant in the cabin as well as the possibility of coolant puddled in the passenger floorboard. The heater core is inside the dash and requires removal of the dashboard assembly in most vehicles. Unless you are comfortable with a large amount of work disassembling the dash, I would refer this to a competent mechanic.

under right side of dash near the blower motor and heater coil.










TIM

Does the sun roof do anything whebn you press the button. if not, check your fuses and the sun roof switch. If fuses are good you want to check to see if the sun roof motor is getting power. If it is getting power it could be the motor itself. If it tries to move but can't then you have a mechanical problem. it might be binding so try giving it an assist by pushing on it when pressing the switch.

if its not blowing then the heater motor is not coming on . first check the fuse then check for power at the blower motor if no power to the motor replace the blower motor resistor located on the same heater box as the blower motor

I have a detailed write up but it is too long to post

Send me an e-mail I can send the write up to