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Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
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  Jim Grant's Tech TipsJim Grant's Tech Tips
Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
If you have any questions, please feel free to email us.
 
 

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  Jim Grant's Tech Tips

'96 Dodge 4wd, Luke Warm Heat

Q: When thermostat opens on my ’96 Dodge 4WD the heater blows only luke warm air. I took it to the Dodge Dealer; they put in a new water pump and thermostat. I still have the same problem. Do you have any ideas?

- Paddy

A: If the coolant is at the correct level and the thermostat is operating at the correct temperature then I would suggest moving your inspection toward the heater. Heater cores can become blocked or restricted. With the engine fully warmed up and the heater blower motor off, compare the temperature of the upper radiator hose with the hose to and from the heater core. The temperature, in general, should be about the same on all three hoses. If you find that one of the heater hoses is cooler, it is possible that the heater core is restricted. To confirm, have a technician check the flow rate through the heater core. If restricted I would suggest a replacement with a full cooling system flush. Depending on which model Dodge you have, beware of an ALLDATA Information System TSB addressing a problem with the cable from the heater control that operates the blend door for the heater. The problem? The cable slips on the arm of the blend door. When this happens the temperature from the heater can’t be controlled correctly. The fix is easy, requiring only an adjustment on the blend door’s arm to prevent the problem.

 
     
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