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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.

runnin a little hot

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  #1  
Old 11-16-2013, 12:11 PM
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Exclamation runnin a little hot

Ran at just over 210 deg (230w/trailer)with leaking water pump, replaced water pump and thermostat but it didn't change temp problem. Then changed out radiator and re flushed system and it still runs hot but wont overheat? It stays just over the 200-220 mark but it should be runnin at 190, upper hose stays real hot, whats my issue?


1994 ram 5.9l
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Old 11-16-2013, 12:14 PM
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Are you losing any coolant?

Sure you got the right thermostat? 195 degrees. Did you check to make sure it opened by dropping it in a pot of boiling water?

What's the lower hose feel like?
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Old 11-16-2013, 03:00 PM
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did you flush the block by removing the drain plugs. my 01 has hex head pipe plugs on each side, hiding behind the engine mounts. mine were sort of hard to get out, because i couldn't get either a socket or a wrench on them straight, and so they tried to round off. i eventually used my best vise grips to break them loose. so if you do this - treat them with penetrating oil beforehand, especially on a 94 that may have never had them off.

anyway, a lot of heavy sediment came out of mine.
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Old 11-16-2013, 03:00 PM
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Hate to say it but you most likely blew a head gasket or cracked a head when it got hot while towing. Also is your plenum leaking? Are your O2 sensors working correctly?
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Old 11-17-2013, 10:18 AM
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not loosin any coolent n I put a new one in and u can tell wen the truck starts heatn up wen it opens cuz it heats up to like 230 then drops suddenly to just over 200, lower hose is hot also
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Old 11-17-2013, 10:23 AM
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I didn't flush the block wasn't sure how to do it, after the plugs are out just run truk with hose in the radiator to flush? ill try that
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Old 11-17-2013, 10:37 AM
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Originally Posted by Dominicsansone View Post
not loosin any coolent n I put a new one in and u can tell wen the truck starts heatn up wen it opens cuz it heats up to like 230 then drops suddenly to just over 200, lower hose is hot also
Sounds like your thermostat isn't working properly. It shouldn't be going to 230 before it opens. Put a Stant superstat in there and see if that doesn't help.
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Old 11-17-2013, 10:48 AM
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What does the lower hose feel like? It should be significantly cooler than the top
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Old 11-17-2013, 12:22 PM
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Originally Posted by Dominicsansone View Post
I didn't flush the block wasn't sure how to do it, after the plugs are out just run truk with hose in the radiator to flush? ill try that
assuming you have new coolant in there, drain radiator to save it. flush block with water hose, either from from the top through the tstat hole or through the bottom radiator hose. make sure clear water is coming out both sides, not just one. i don't think running the engine would do anything different from putting the hose in it for several minutes.

if this doesn't help, you should investigate the possibility of head gasket problem. like arde said, temp should not spike up. it should just heat up to the 195 target and simply hold there.

another question- from a cold start, with radiator cap off to relieve any possible pressure build up, does the temp spike up to 220, or act more normal. this would be evidence of compression leak.
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Old 11-17-2013, 06:23 PM
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Might just be air as well. Drive it for a bit. let the engine get nice and warmed up. (but, don't overheat). Let the thermostat cycle a few times. it should straighten itself out.
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Old 11-17-2013, 07:54 PM
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I was going to say the same thing HY. Could be an air pocket or even a few of them and as said already you just need to run it for a while.
One other trick is to raise the front of the rig to help burp the air out.
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Old 11-18-2013, 10:30 AM
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Quote:
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What does the lower hose feel like? It should be significantly cooler than the top

it is slightly cooler
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Old 11-18-2013, 10:33 AM
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Might just be air as well. Drive it for a bit. let the engine get nice and warmed up. (but, don't overheat). Let the thermostat cycle a few times. it should straighten itself out.

I did that n cycled out the air didn't help it that was my first thought, ran it for a while shook it and squeezed on the hoses till no more air bubbles
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Old 11-18-2013, 10:38 AM
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Originally Posted by dhvaughan View Post
assuming you have new coolant in there, drain radiator to save it. flush block with water hose, either from from the top through the tstat hole or through the bottom radiator hose. make sure clear water is coming out both sides, not just one. i don't think running the engine would do anything different from putting the hose in it for several minutes.

if this doesn't help, you should investigate the possibility of head gasket problem. like arde said, temp should not spike up. it should just heat up to the 195 target and simply hold there.

another question- from a cold start, with radiator cap off to relieve any possible pressure build up, does the temp spike up to 220, or act more normal. this would be evidence of compression leak.

with cap off it still goes up to just over 200 n stays the same
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Old 11-18-2013, 10:43 AM
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Quote:
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Sounds like your thermostat isn't working properly. It shouldn't be going to 230 before it opens. Put a Stant superstat in there and see if that doesn't help.


its a cheap one from advance so I was thinking maybe its faulty even tho its rated at 190, ima flush my motor later like dhvaughan said n see wat that does if not change the tstat n maybe fan clutch
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Old 11-18-2013, 10:47 AM
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Originally Posted by Wildman4x4nut View Post
Hate to say it but you most likely blew a head gasket or cracked a head when it got hot while towing. Also is your plenum leaking? Are your O2 sensors working correctly?

plenum isn't leaking and im not sure on 02 sensors, no smoke at all tho wouldn't that be showing if I had a head gasket problem? no ticking or knocks either?
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Old 11-18-2013, 11:22 AM
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Replace the stat when you do your flush. if it was a cheap stat.... might be the whole problem right there. Plus, being able to put the hose right in that hole gets you some good flow thru the block to flush out the junk.
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Old 11-20-2013, 12:42 AM
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Check your fan clutch. Had a similar problem, my fan clutch and a small leak at the water pump ended up being the problem. Leak was so small it never made a puddle, but was enough that I had to add coolant every week.
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Old 11-20-2013, 09:29 AM
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From my experience with the parts store brand tstats, they don't run the optimum described temperate ever. I've had better luck with stant's. They all say motorad or murray on them. The parts stores get the factory seconds built cheaper.
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Old 11-25-2013, 07:30 PM
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I took out the drain plugs n flushed the system for about 10 mins, refilled coolent n it didn't help ****. So I replaced the fan clutch since aamco told me mine was bad thought maybe that was the issue but that didn't do anything either. After I Installed it it ran at 190 for like a minute then shot up to 250 then went back down to 210 so idk ima get a stant tstat n maybe that's the issue, everything else is new (water pump, radiator, tstat, n now fan clutch) n all hoses are good with no leaks anywere so if that's not it I think I have a much bigger problem.
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Old 11-25-2013, 07:30 PM
 
 
 
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