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Heating & Cooling 4th Gen Dodge Ram Heating & Cooling Problems and Questions.


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  #31  
Old 03-21-2012, 04:14 PM
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Originally Posted by snrusnak View Post
Yeah but if that was the case other things (PS pump, AC compressor, alternator) would spin backwards probably. Unlikely like you said.

Gotta be either air or a clog I'd think.
Yea pretty much, I think it's air in the system.
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  #32  
Old 03-21-2012, 04:18 PM
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^where in FL are you ramvan?
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  #33  
Old 03-21-2012, 04:40 PM
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^where in FL are you ramvan?
Flagler Country, Palm Coast to be exact.
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  #34  
Old 03-21-2012, 10:51 PM
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You actually took a rep point away from me, I had 44, I got 43 now... But don't worry about it, we're even. I'm not a emo, I'm a very serious person.
Not true Mr. Serious. Have a look and have a Beer
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  #35  
Old 03-21-2012, 10:55 PM
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And grab me one while you're up...
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  #36  
Old 03-22-2012, 12:18 AM
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Originally Posted by snrusnak View Post
Sounds like you have an external transmission cooler (separate from the radiator). You could use light water pressure to clean it off, don't "scrub" it or anything, you don't want to damage it. Since it's a separate cooler, this is almost certainly not causing a hot engine.

You also most likely have a power steering pump cooler in the same area in front of the radiator, I bet if you trace the lines from the power steering pump they go to another external cooler.

Sounds like you have a good thermostat (stock is 195 deg F by the way). If you used an oem replacement from autozone that should be fine. A 180 thermostat is a good idea, but is not the fix for your problem, something else is going on.

Sounds to me like you have a newish, clean, and not clogged radiator.

Also sounds like you have a new water pump, which is almost certainly not defective (although possible that it could be...).

Your heater core sounds like it may be clogged. This won't affect engine overheating though.

If your radiator hoses are not clogged, and the engine does not have a clog in it, then you must have air in the cooling system.

Also sound like your clutch fan is good.

Did you purge the air out after refilling the coolant? Air in the system will definitely cause sporadic heat spikes. You need to park the truck so that the radiator is the highest point(put it on a slight incline, or jack the front up a few inches). Then remove the radiator cap, start the engine, turn the heater on, select the floor vent setting, put the fan on high, and make sure the heat is set to HOT. Then monitor engine temperature let it get as hot as it will get (to operating temperature). While it's running you can "hit" the radiator hoses or squeeze them to try to dislodge any trapped air. At some point the thermostat will open (at about 195 deg F) and water in the radiator should go down and enter the engine. You can then refill the radiator to full, then fill the expansion tank to full, replace radiator cap and then after a few heat cycles of running the truck you may need to add a little more coolant again.
After installing a radiator, it's very possible it could have air, that's actually not a bad idea at all? I will do that...now do you honestly think air in the system is causing high rpm over heat?? And where could I get a 180 t-stat?
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  #37  
Old 03-22-2012, 12:30 AM
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Originally Posted by ramvan2500 View Post
Well all of use together kind of knocked alot of suspects off the list.
It could be possible that either the radiator is restricted of air or internally, or not likely but he might have to much alcohol and not enough water. The next thing could be that the drivebelt is router wrong causing the water pump to pump backwards...
Alcohol?? I use 50/50 Prestone Umm, now I'm kinda confused here, how do you re route the belt wrong? The motor turns one way! But yeah man, I'm gonna try these ideas and see how it goes! So the transmission cooler is definitely not a concern now?? I'm still gonna clean it gently to be on the safe side! My next question is, when the truck is started and running at idle with the radiator cap off, once it reaches normal temps, it won't start flowing out??
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  #38  
Old 03-22-2012, 12:51 AM
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^no it won't overflow. Since the system will be open (not sealed), it will not build up pressure and therefore the water/coolant will not really expand at all. The coolant expands under normal conditions in a car because it is sealed and builds up pressure with temperature and when water heats up it expands.
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  #39  
Old 03-22-2012, 10:08 AM
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Alcohol?? I use 50/50 Prestone Umm, now I'm kinda confused here, how do you re route the belt wrong? The motor turns one way! But yeah man, I'm gonna try these ideas and see how it goes! So the transmission cooler is definitely not a concern now?? I'm still gonna clean it gently to be on the safe side! My next question is, when the truck is started and running at idle with the radiator cap off, once it reaches normal temps, it won't start flowing out??
I meant glycol which is a type of alcohol, long time ago anti-freeze use to be methnol but it evaporates quick so that is why the standard is ethyl glycol alcohol. I mix my own, it's cheaper this way and well it can be a benefit in terms of concentration.

The transmission cooler isn't a worry at this time, if you can't get the engine temp to stay down then obviously in trouble. No the coolant shouldn't start flowing out, when it starts to flow add some more coolant into the radiator then put a rad cap on it. I have always done it this way and I never ever get air trapped and I never had the fluid come out.
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  #40  
Old 03-22-2012, 10:10 AM
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After installing a radiator, it's very possible it could have air, that's actually not a bad idea at all? I will do that...now do you honestly think air in the system is causing high rpm over heat?? And where could I get a 180 t-stat?
Yes I honestly believe that the air in the system will cause high rpm overheats, it happened to me a while ago when I was flushing my radiator out, when idle it would be cool but as soon as I started to drive the temp would climb and I would have to stop and let it cool. You could probably get a 180 at a local auto parts store.
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