Question about Cars & Trucks
Could be a number of things. Easiest, check your coolant level. Next run the vehicle for a while, compare the upper and lower radiator hoses for temp difference, by touch, also check the smaller houses entering the fire wall. Have you changed the t stat?
Posted on Dec 28, 2013
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Posted on Jan 02, 2017
I would first check to see if both heater hoses are hot to the heater.
if 1 is hot and 1 is cold the heater control valve is closed or the heater core is plugged.
Posted on Jan 14, 2009
Has the vehicle overheated recently, if not there is a failure of the Coolant from engine valve controller, that measures flow through the Heater Matrix. Come back with more, as necessary.
Posted on Aug 29, 2009
are heater inlet outlet mix valves standard for all dodge heater cores. I have 2001 dodge cummings blows warm air not hot when gauge is 195 degrees would there be a mix valve under the dash because it is not inline outside the wall
Posted on Nov 19, 2009
Have you checked the coolant level? What you describe is exactly what happens if the coolant level is low. When stopped at idle, hot coolant is not circulating through the heater core, so no heat. As the engine increases in rpm's when you pull away from the light, the water pump is spinning quicker, and some coolant is making it to the heater core. So check the level, and if it is low, keep an eye on it to see if it drops again. That of course indicates a leak somewhere. Get it fixed, as overheating the engine leads to costly repairs and worse case a new engine. Let me know how you make out with this.
Posted on Dec 05, 2009
Testimonial: "Thanks Curt! You were right ON!"
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