Question about 2002 Dodge Durango

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I have a 1999 dodge durango, the problem, I get good heat out of the back seat heater but the front heater (on any setting) blows cold air. I have changed the intake manifold and thermostat but still no heat in the front. Any ideas?

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  • vanwycar Jan 09, 2009

    motor1258,

    Yes, the problem was there prior to replacing the thermostat and was the reason for replacing the thermostat. There was no change, I still have heat in the back but not in the front. The back heat speed setting is controlled by the front heat setting (low, medium, high) but the back heat can be changed in the back (on, off, floor, top) The back heat is very warm but the front heat is cold, the blower works on all settings.



    toptech02150,

    The person doing the work on my truck says there is not a heater control valve for the front unit. If there is where is it? Would it also control the back seen as how the heat setting for the back is controlled by the same control as for the front?

  • vanwycar Jan 09, 2009

    motor1258,

    Yes, the problem was there prior to replacing the thermostat and was the reason for replacing the thermostat. There was no change, I still have heat in the back but not in the front. The back heat speed setting is controlled by the front heat setting (low, medium, high) but the back heat can be changed in the back (on, off, floor, top) The back heat is very warm but the front heat is cold, the blower works on all settings.



    toptech02150,

    The person doing the work on my truck says there is not a heater control valve for the front unit. If there is where is it? Would it also control the back seen as how the heat setting for the back is controlled by the same control as for the front?

  • Mike Butler
    Mike Butler May 11, 2010

    Have you checked for flow through front core, at firewall? Touch hoses for heater going into firewall, they should be hot in & out when engine at operating temperature. If one quite a bit cooler than the other, there's a flow problem. Did you run the engine with cap off for a while & heater on when replaced thermostat, and was that problem there before thermostat changed, is that why you did the thermostat?

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When the engine is cold,check the coolant level.

Make sure it's on max.

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A coolant system should be flush every two years.

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If you did a coolant flush recently then air pocket can be the cause of the un-even heating problem.

The DIY method is to drive you car onto a ramp or a steep hill.

Iet the engine cool off and top off the coolant tank.

Set MAX heat + MAX fan

Let the engine ran for 20 minutes wih the cap off and the trap air will escape from the coolant reserve tank,

Check coolant level and top off coolant when the engine cools down.



A shop will charge $75+ for this but using an air operated excavate tool!

========

A car with over 90K miles may experience linkage problem to the heater control valve.

The heater control valve (near the firewall) may be stick over time.

Open the hood and move the heater to max and min. Back and forth.

Clean and lube the linkage with WD-40 to free the heater control valve.

If it's a vacuum type heater control valve then cash for leaky vac. hoses.


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Move the fan switch back and forth to re-new the electrical conductors.

Pass a vacuum over the control panel to prevent dust build up behind the console.

Posted on Dec 03, 2009

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You know , the heater core is fine , blower is fine , controller is somewhat ok , to my possiblty problem that water pump it self does not have out let heater hose to hook up , i thick it should redesign the water pump with out-let heater hose to attach si it can produce more presure(force) into heater core , thanks

Posted on Mar 20, 2009

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  • 141 Answers

Heater control valve for the front unit is bad.

Posted on Jan 09, 2009

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