No heat at idle
#1
No heat at idle
I tried searching for this problem with no luck so here goes. 2001 dodge ram regular cab, auto trans, 5.9cid, 98,000 miles. I had a very leaky radiator, so i finally broke down and bought a new one. Last weekend i swapped out radiators. Everything seemed to go fine but after driving it my heat goes away at idle. driving the truck the air comes out hot but at a stop light the air cools off drastically. as soon as i stop so does the hot air, as soon as i take off the the hot air comes back. The blower motor stays at speed, the air coming out just gets cold at idle. Every time i check fluid level its full. Any help would be greatly appreciated. thank you.
#2
Do a search on this subject, I listed some of the things I found, feel the hoses at idle when this is happening, it tells you which direction to go next, if they are both real hot, then it is a flow distribution problem, with the blend door or something else, if one hose is real hot and the other is just a little warm then you could have a huge air bubble in it, , this happens sometimes to my workers when the radiator is replaced or a large amount of water is lost.....
#3
#5
No i did not change the thermostat. the temp gauge is in the normal position when warmed up. The outside temp was in the thirties on the weekend and in the single digits Monday and Tuesday. It did not make a difference from the thirties to single digit temps, no heat at idle but good heat driving.
#7
I am in the same boat and at wits end. Air trapped in the line is the only thing that can be left to try to remove. My last and final attempt is going to bleed the core by using that funnel that sits on top of the radiator and the prestone flush kit. I am going to pinch off the outlet line and open the cap on the prestone flush kit. That force liquid through the core backwards and hopefully push out any air. I can then cap it off as the liquid flows since the funnell will hold a fair amount of coolant so I don't have to worry about empting out the radiator and being back in the same situation.
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#8
I am in the same boat and at wits end. Air trapped in the line is the only thing that can be left to try to remove. My last and final attempt is going to bleed the core by using that funnel that sits on top of the radiator and the prestone flush kit. I am going to pinch off the outlet line and open the cap on the prestone flush kit. That force liquid through the core backwards and hopefully push out any air. I can then cap it off as the liquid flows since the funnell will hold a fair amount of coolant so I don't have to worry about empting out the radiator and being back in the same situation.
#9
#10
thanks for all the reply's. card board won't work for me. my transmission cooler is in front of my radiator. It just seems strange that my heater worked really good before the radiator change and now it doesn't. When the radiator was leaking the heater would shoot out cold air when the antifreeze got low at idle but after i filled it up it would throw heat at idle again. It does seem to take longer for the temp gauge to move now also.