Question about 2007 Dodge Ram Truck

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Dodge Ram 1500, air will blow when switch in high position.

Switch unit was replaced and air will still not blow in low or medium position.

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Most probable cause is resistor card,during high blower setting system bypasses resistor card to supply full 12 volts,only lower speeds need resistance to control blower speed.

Posted on Jun 16, 2009

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Check the blower resistor for burned or damaged coils.

Posted on Jun 16, 2009

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1 Answer

Blower motor only works on low and medium on 2007 dodge nitro


You replaced the resistor and WHAT relay? The blower motor circuit on a 2007 Dodge Nitro does not use a relay.

The blower resistor gets it's power from the A/C - heater control unit.

If you check for voltage at the blower motor resistor connector (Key on, relay disconnected), the DARK BLUE/GREY wire should be hot when the control switch is on HIGH. The DARK BLUE/VIOLET wire should be hot with the switch in the MEDIUM 2 position.The DARK BLUE/ORANGE wire should be hot with the switch in the MEDIUM 1 position. The DARK BLUE/BROWN wire should be hot with the switch on LOW.

If any of these are not as stated above, then you either have a bad A/C - heater control unit, or faulty wiring between the control unit and the resistor.

Jun 02, 2012 | 2007 Dodge Nitro R/T New Cars

1 Answer

Low and medium speed fan for ac does not come on, while high speed fan works. 2000 1500 dodge van, had new condensor unit under dash replaced recently.


Blower motor resistor needs replacing. Follow wires from blower motor to connector, which should be the resistor. Usually in duct work, held in by 2 small screws.

Jul 25, 2011 | 2000 Dodge Ram 1500 Truck

3 Answers

I have a Doge Ram 1500. Am unable to get heater to put out hot air. Blower motor will blow cold air in AC mode. What should I check and what steps to troubleshoot? Thanks for your help. Mac


You may need to add coolant to the cooling system, That is considered secondary and if the level is low the engine gets coolant priority, after you add check it again soon, as it may get air locked and once you drive it it may go low again, if that isn't the problem then you may need a thermostat is the engine warming up?

Dec 03, 2009 | 2004 Dodge Ram 1500

1 Answer

1999 Dodge Ram 1500 A/C acts like there's a short in the wiring


Have you checked for freon leaks. It sounds like it's low and the pressure switch drops out. Try adding freon.

Aug 01, 2009 | 1998 Dodge Ram 1500 4WD

1 Answer

Ac blower fan problems


change the blower resister module,if this doesnt work replace the control head

Jul 05, 2009 | 2000 Dodge Ram 3500

1 Answer

Dodge Ram AC not blowing cold


By pass both pressure switches one at a time with small wire or a paper clip. If comperssor kicks on replace the swich that you bypassed.
if not it could be the fan clutch ot the compressor. Compressor runs about $400.00

Jun 15, 2009 | 2000 Dodge Ram 1500 Truck

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