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


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  #1  
Old 08-25-2016, 08:25 PM
tecnomuzik tecnomuzik is offline
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Default High Coolant Temperature

Hello everyone. Last night while out driving my overheat light came on and the coolant temperature was over 250. I was able to get home and deal with it today when it had cooled down.

I checked the coolant stick and it showed like it was bone dry. I got the Mopar coolant, mixed it 50/50 with distilled water and filled it up to max. I drove the truck around for a while and it never hit 250 but the temps were all over the place. It would shoot up to 240 something and then would drop down to around 205 then slowly creep up to 230 something and slowly drop down again.

Anyone have any suggestions on what may be happening? Bad thermostat?

Thank you in advance!
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Old 08-26-2016, 12:21 AM
tecnomuzik tecnomuzik is offline
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After further searching on these forumz, I saw that tank is just an overflow. I checked the level in the radiator and it took about a gallon of coolant. I burped it and drove it for a while and the temp never went above 204.
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Old 08-28-2016, 04:06 PM
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Glad it was an easy fix so far. Did you do anything recently that would have drained coolant? That stuff just doesn't disappear.
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Old 08-28-2016, 05:40 PM
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Quote:
Originally Posted by jasonw View Post
Glad it was an easy fix so far. Did you do anything recently that would have drained coolant? That stuff just doesn't disappear.
+1 to this; seems like just low coolant, but why? Trucks shouldn't just consume coolant
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Old 02-20-2017, 08:28 PM
tecnomuzik tecnomuzik is offline
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Sorry for the very late response but no, I hadn't done anything that would have caused the coolant to drain. But I'm back on the Z tonight because I'm having over heating issues again.

A couple of weeks ago I got a check engine light. I got it scanned and it was P0118 and the tech at AutoZone said that *usually* indicates a bad thermostat. When I started the truck that night to leave AZ, the engine light was off - AZ didn't reset it either. I continued driving the truck until this morning when I left for work the engine light was on again. On my drive home the coolant temp got up over 240 by the time I got home. My drive is about 20-25 minutes with most of that being expressway driving.

I just replaced the thermostat (203 - didn't go the 180 route) and drove the truck for a while and the coolant temp got up to 210-212. On a side note, the coolant level was still good, minus what I lost when I replaced the thermostat.

Any educated guesses as to what may be happening? Bad radiator?

*Edit* FYI after replacing the thermostat and going for a test drive the check engine light is off again.
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Last edited by tecnomuzik; 02-20-2017 at 08:33 PM.
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Old 02-21-2017, 12:19 PM
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Your indication appears to be working; it is reacting to temp. changes, but the fluctuations in temp. is usually caused by air in the system.
Before replacing anything, you should do those small things that cost nothing: make sure the coolant is full, and the overflow bottle is at the appropriate level ( cold or hot water).
Be sure there's no air in the system; best way to find out, is to bleed with the front end up, the thermostat opened( operating temp.), the rad. cap off, and engine speed above idle to assure good flow.
Keep monitoring water level; if it goes down, you're looking at a possible intake leak, or a pin hole in the rad., causing a "mist".
A rad. shop can flowtest your rad., if everything else looks good.
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Old 02-21-2017, 06:27 PM
tecnomuzik tecnomuzik is offline
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Thanks for the tip 300m. I just got home from work and the temp gauge was all over the place today. On my way home it got up to 230 and then came back down to 204. I'll let the truck cool down for a few hours and go burp the system again and see what happens.
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Old 02-22-2017, 03:31 PM
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Quote:
Originally Posted by tecnomuzik View Post
Thanks for the tip 300m. I just got home from work and the temp gauge was all over the place today. On my way home it got up to 230 and then came back down to 204. I'll let the truck cool down for a few hours and go burp the system again and see what happens.
Actually, the only time you should bleed the system, is when the thermostat is open; (engine hot) now the air can travel to the rad. and out to atmosphere. With the thermostat closed, there's no flow between the rad. and engine, and the pump only circulates water within the engine and heater core. I always run the engine above idle for a good long minute...
Good luck.
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Old 02-22-2017, 03:33 PM
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+1 for the air in the system. Had a 2001 Ram 1500 that I replaced the water pump on when I installed electric fans (good ol' 5.9L V8), and took me a while to get all the air burped out of the system. When it had air, it's temps fluctuated like yours.

Check up underneath your water pump as well for a slow, intermittent leak. My wife's 2014 Grand Cherokee with the Hemi had one of those that you couldn't tell at all from the top of the engine. Only symptoms: for two oil changes in a row (when I glance around and check all the other fluids as well), the reservoir tank would need a small topping off.

The leak was a slow one, straight down from the center of the water pump, and pooled on top of one of the plastic skid plates. It was sufficiently slow that the pool dried enough that it never flowed off of the plate, so never saw puddles on the garage floor. Found it when I was changing the oil filter on the third oil change. Thought I smelled coolant, and sure enough, with a flashlight was clearly able to see the dried, crusty trail of the coolant from underneath.
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Old 02-28-2017, 10:34 PM
tecnomuzik tecnomuzik is offline
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Thanks everyone for the suggestions. I bled the cooling system and have been running the truck for a few days and have had zero issues. The check engine light has also not come back on. I feel confident this issue is resolved.
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