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2nd Gen Ram Tech 1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.

No heat at idle

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  #1  
Old 12-16-2008, 09:10 AM
aliasmax aliasmax is offline
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Default 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.
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  #2  
Old 12-16-2008, 11:40 AM
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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.....
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Old 12-16-2008, 04:25 PM
aliasmax aliasmax is offline
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Okay after driving the truck on the expressway for 25 miles i popped the hood and felt all the hoses. the two heater hoses where hot, the top radiator hose was hot but the bottom radiator hose was ice cold.
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Old 12-16-2008, 04:57 PM
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did u change your t stat and how cold is it there??
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Old 12-16-2008, 07:06 PM
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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.
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Old 12-17-2008, 11:24 AM
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Is it possible that a worn serpentine belt or a water pump cause the no heat at idle?
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Old 12-17-2008, 12:06 PM
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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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Old 12-17-2008, 01:29 PM
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Quote:
Originally Posted by sungod View Post
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.
Before you go through all that... I thought I would let you know I have the same issue. I never sit in my truck and let it idle because of that problem. I just figured the truck is cooling faster than the engine makes heat at idle. The other problem I have is it takes forever to warm up. Even though, I'd rather have my truck run cooler than hotter. You might try blocking off part of the radiator and see what happens.
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Old 12-17-2008, 01:38 PM
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I blocked off part of my radiator with cardboard and it seemed to help, but I got hardcore stuck and had to rip it off as the truck was overheating. Turns out the fan was stopped by snow, which is what was causing it to overheat.

Anyway, moral is cardboard helps.
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Old 12-17-2008, 02:19 PM
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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.
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Old 12-17-2008, 02:28 PM
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Slide the cardboard down in between the rad and the trans cooler and ac condenser!
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Old 12-17-2008, 05:42 PM
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Quote:
Originally Posted by pcfixerpro View Post
Before you go through all that... I thought I would let you know I have the same issue. I never sit in my truck and let it idle because of that problem. I just figured the truck is cooling faster than the engine makes heat at idle. The other problem I have is it takes forever to warm up. Even though, I'd rather have my truck run cooler than hotter. You might try blocking off part of the radiator and see what happens.
I thought about that and taped off the fan to see if it made a difference. It didn't. It does take a long time to warm up, but I get heat when the gauge starts to move. I can tell a little difference in heat once the thermostat opens and I can see the temp gauge drop back slightly. I already have the prestone kit on my truck so bleeding the core won't be a big deal. I hate to think that the water pump doesn't make enough pressure to force air out, but I can see that there could be air trapped because the core sits higher than the radiator. Kind of a dumb design.
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Old 12-17-2008, 05:48 PM
rango726 rango726 is offline
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i went through the same thing last winter. i bought a back flushing kit at the auto parts store and flushed it several times. the crap that came out was incredible. worth a shot. i know you just put a new radiator in but maybe your water pump is full of junk? good luck
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Old 12-18-2008, 09:40 AM
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Yesterday i took the radiator cap off when the truck was cold, i ran the engine. after the temp gauge got to normal i ran it at varying rpms for 1/2 an hour. (the truck was not moving) the antifreeze in the radiator was cold. not even warm, it was cold, as was the lower radiator hose.
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Old 12-24-2008, 09:58 AM
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something new. yesterday coming home from work the heater was working perfectly. had hot heat blowing out when i would come to a stop. Now today i took a 20 mile drive and every time i came to a stop the heater would start blowing cold air again. I am lost. it's driving me nuts.
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Old 12-24-2008, 03:07 PM
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Default In the same cold boat

So far I am leaning towards the blend door or an air conditioning problem with my 99. So far I have checked the coolant level and all hoses both cold and at operating temp. I noticed my air conditioner compressor is running in heat postions, even with the heat selector all the way HOT. I pulled the compressor clutch connector and things are much better, but something obviously isn't right. Still searchin in the cold......
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Old 12-24-2008, 03:23 PM
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The AC runs to keep the condensation down when on defrost, and to keep it and the AC system lubed up and moving during long periods of non use, like in winter.
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Old 02-01-2009, 08:23 PM
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I have a 2000 2500 with the same flipin' problem! Heater core leaked so I replaced it and now no heat at idle. Removed (I thought) all the air from the cooling system (several times with no real big amount of it!), replaced thermostat, water pump and belt and still no heat at idle. Core inlet hose is burning hot and return hose is the same. Blend door servo motor is moving blend door fully open. It's electric and not vacuum operated so not a vacuum issue. I'm lost!! Tried bleeding more air out of it today and got maybe 2 more cups of antifreeze in it. I can't figure this one out. I've thrown a bunch of money at it and now there is nothing left to replace. Have you guys figured this one out on your trucks yet?
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Old 02-08-2009, 01:32 PM
Mruzu1 Mruzu1 is offline
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Question Almost the same?

97 ram 3.9 liter 6 same deal, no heat at idle. I flushed my cooling system last year purged it and tried getting all the air out. I get a gurgle out of my heater core sometimes as if it still has air in it.
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Old 02-08-2009, 03:39 PM
dillonjm dillonjm is offline
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My 01 has the same issue, I'm having a hell of a time getting the air out of the system, have tried purging 5 or 6 times this winter.. I even adjusted my electric fan up to 200 instead of 180 and put some cardboard in, it warms the temp gauge up faster, but doesnt help the heater much. I kind of gave up on it.
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Old 02-08-2009, 03:39 PM
 
 
 
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2001, 2003, air, blows, caravan, cold, dodge, heat, heater, idle, idling, intrepid, problem, ram, speed, stratus

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