Question about 2000 Mitsubishi Diamante

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Air blows cold even though i have it on warm

Fuses are good, coolant is fine.

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  • Mitsubishi Master
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There are several things which can be done to diagnose the problem. First, with some of the Electronic Digital Climate Control units, if you have this type, there is a self-diagnostic routine a Technician can punch into the keypad for an evaluation of the system. You would need the sequence of the display buttons and a list of applicable Codes. This is something a Dealer would know.

Next, Check your heater hoses entering and exiting the heater core. This is essential in determining the presence of heat. Both hoses should be equally hot when the engine is running and the heater is turned on. If the water is not flowing through the hoses a water control part is bad or the heater core is plugged. This is when you look at water flow control valves or solenoids.

These control parts are activated either by direct cable, electric wire, or Vacuum lines. For the Vacuum devices, you should check for the presence of Vacuum to the operating Solenoid.

If you have equal heat in the heater hoses, then you look at the ductwork under the dash. A small flap control must be failing to route airflow past the heater core.

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Posted on Nov 28, 2012

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polarcycle
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SOURCE: The air conditioner blows warm air at idle but

Sounds like the fans by the radiator are not coming on. Check relays, wiring, fan motors, temp sensors, PCM.

Posted on Jul 29, 2009

  • 107 Answers

SOURCE: mitsubishi montero limited heater blows cold air when idle

Partially clogged heater core or bad thermostat if that's not the problem check the switched

Posted on Dec 31, 2011

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