Engine/Transmission (1998.5 - 2002) over heating

[runningbird]

my 98. 5 has been overheating for the last 2 months. it does not matter what the outside temp is. it overheated last week in the mountains when it was 55 degrees. it only happens when towing either our horse trailer or 24' tt.

I am seeing motor temps of 220-230 and auto trans temp of up to 250. it the last month I have replaced t-stat, radiator, fan clutch.

sure could use some help

thanks

mark

 

[dodgeboy01]

My truck did the same thing this past week. I was pulling my toy hauler which was 10,700lbs. I was pulling a 10mi. up hill single lane road in second gear and right before cresting the hill my tanny temp was 250 and my truck temp was 230 and the idiot light came on to check gauges. When I crest the hill I pulled over and let the truck idle for awhile then it was down hill and everything was just fine.

 

[runningbird]

right on, that's what happens but as I coast down the hill my transmission does not cool. on the other hand within one minute my engine is at 180. I'm stumped.

 

[Chasweaver]

overheating

Been there done that! I had checked the fan clutch and it outwardly showed no problems. The inside of the raditatior looked clean.

A good friend showed me the dried goo on the Fan Clutch and showed me the outside of the raditator. . It only took about 2 hours to pull and clean the radiator and replace the fan clutch. Since that was done I have pulled my 12000 lb fifth wheel trailer 1500 miles Including a 6000 foot pass in Utah and never raised above normal. . I checked the radaitor shop and was told the inside of our alum radiators do not stop up and do not need cleaning... Good luck, Charlie

 

[runningbird]

well like i said. i have replaced everything and still am overheating.

 

[Chasweaver]

If it were a gaser I would say head gasket. Charlie

 

[Graphic man]

are you sure it is not air locked?



i have seen that a few times air gets trapped and can cause the same thing.



also check the rad cap(psi) and pressure test the system.







Scott

 

[runningbird]

the system was presure tested, and ok. I did not replace the rad cap so I will do that today before I head out with the horses.

mark

 

[Joe Mc]

Runningbird - have you recently installed a new thermostat? If so there is a little bleeded hole on the ring which is supposed to be installed hole up - this allows air to not get trapped. If you haven't changed the stat maybe yours is hanging open not allowing the exchange of cooled coolan from the rad to exchange with the heated engine coolant. You should try a new stat - get it from cummins, 180 degree part number is 3954194, I think it was $20. The parts house ones are trash and will not last. Good luck.

 

[PC12Driver]

Have you cleaned your radiator lately? Ya' gotta pull it out to do it right. More info and pics here.

 

[runningbird]

thanks for the help. it does have a new 180 degree t-stat from cummins. and the rad is new last week. I got a new rad cap today and will give it a try in 2 hours. pulling 4 horses. wish me luck.

mark

 

[Joe Mc]

OK new stat. Was it installed with the little hole and valve thingy at the top so air bleeds out when filling it? Air if any in the system should eventually work it's way out to the reservoir tank but if the bleed hole is doen instead of up . . . ????

 

[WestTN]

You just might need a water pump.

 

[runningbird]

t-stat was installed correctly. new rad cap did not help. I'm thinking the water pump is ok because it cools down so quickly once I crest the hill, i'm talking less than 1 min.

mark

 

[DavidC]

Bottom radiator hose collapsing ?.



Dave

 

[PKozlowski]

Sounds like what I went thru. Take the radiator out and clean it. I don't mean the inside, Clean the outside. Mine had so much gunk in it because of the blow by tank.

Look between the radiator and the intercooler. Can you see down there?



PC12 driver, have any interesting flights lately?

Pete

 

[runningbird]

the radiator is brand new. 2 weeks ago. old one was clean on the outside.

 

[PC12Driver]

PC12 driver, have any interesting flights lately?

Pete

As a matter of fact, yeah. I just flew a 9 year old girl back home yesterday (MO to AL) after she had back surgury to fuse her lower three vertebra. I removed the back four seats and we loaded her through the cargo door and just strapped the stretcher down. The Pilatus makes a really good ambulance. The flight itself was kinda long and boring, but my karma meter should be back over in the green again!

 

[Troubleshooter]

Regarding the overheating transmission -- think about installing the Mag-Hytek "double deep" transmission pan (Geno's has them). It adds about 4qts of fluid capacity and helps keep the temps down. I installed one a few months back and swear by it! In fact the only time it's gotten above 200F was multiple attempts of backing a 5th wheel into a tight spot (guy who was acting as ground-guide didn't know what he was doing, but that's another story).



My Xmsn temps usually run in the 120-140F range during highway towing; rarely up to 180 or so if in traffic.

 

[runningbird]

I have had the double deep pan since 2000. still overheating.

help please.