overheating...? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 9 (permalink) Old 04-18-2010, 10:48 PM Thread Starter
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overheating...?

anyone have any problem with overheating while towing.. right now its already in the low 90's and coming home from work mid afternoon on the freeway i hear my fan clutch come on and off. the temp gauge does stay below half. im headed down baja in a month towing 8000lbs and worried i might have problems...
the second gen radiator is about 50% bigger, any issues with first gen cooling or should i simply get my radiator cleaned... i plan on turning the pump up a bit before my trip....
Eric
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post #2 of 9 (permalink) Old 04-19-2010, 02:51 AM
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Just a sugestion, why not have someone like keydl have a look at your truck and give you some sugetions?
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post #3 of 9 (permalink) Old 04-19-2010, 06:42 PM
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I would bet it is coming on because of the air conditioning. Cleaning the rad and being sure, there is no debris between the AC core and the rad is always a good idea, and if the coolant is dirty do a flush. Just a thought!

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post #4 of 9 (permalink) Old 04-20-2010, 03:43 AM
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That is a good place to start John3. There can be other factors on a truck with a little age say a missing fan shroud, a weak fan clutch, the blow by oil causing dirt and trash to stick to the radiator, requiring a presure wash, a partial blockage in the radiator, and the list goes on.
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post #5 of 9 (permalink) Old 04-20-2010, 11:50 PM Thread Starter
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those are all good points however i dont have a missing or damaged shroud, any dirt, no oil, the fan cluth feels fine and my fan clutch engaging only happens at freeway speeds and as i said the guage never goes above half.
anyways, what i was simply asking was if those trucks out there towing have any temperature issues. is it a problem with the first gen or is something wrong with mine... im not asking for a solution i'm simply looking for a starting point. if the first gen has an issue with running a bit hot then nothing is wrong...ok, something is wrong but its normal...!
i just want feedback from those who tow...
eric
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post #6 of 9 (permalink) Old 04-21-2010, 07:39 AM
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I have never seen a hot 1st gen that did not have a problem.

One of the common ones is the weeping from the head gasket over the thermostat, that can often be cured with cooling system sealer. The coolant is 8-10 in down in the radiator before it shows on the gauge. That is not your problem.

You hear the fan come on, if it did not sound off it might be a problem.

If you pull the fan and shroud and back wash the radiator to check for bug parts and there are a moderate amount then pulling the radiator to get to the condenser and trans cooler is a good plan - the bug parts get broken and the bits build up, common on the high plains, not so common on the interstate.

This is one of the failure modes of a thermostat, the wax leaks out so that it opens 1/2 way. Cummins thermostat cost me $52, Stant was $12 - the Cummins thermostat on my friends works correctly, mine will cycle up to 1/2 gauge and fall back to the 1st division before working right when the temperature is under 40 F. When the last one failed it did not warm past the first division - cool enough to hold a hand on the radiator.

Last on the list is the waterpump, take a look at the nubs on the impeller and look for seepage at the weep hole.

They can air lock, when filling open a heater hose connection.

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post #7 of 9 (permalink) Old 05-28-2010, 02:26 AM
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Im not trying to step on anybodys toes but I wouldnt run anything but a cummins thermostate. Other brands seem to have problems. About a year ago while pulling 10,000 pds my truck was getting hot. When I got home I dumped the radiator and pulled it out. About 70% of the fin area was plugged with dirt and bugs. Had it boiled and cleaned and put a cummins thermostate in and never did I have a problem again. hope this helps.

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post #8 of 9 (permalink) Old 05-28-2010, 07:57 AM
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A couple of the Stant brand thermostats had a problem holding temperature, never had the 1 division drift with a Cummins original - $6 or $50 - some of the Stant work OK. Some work weird - up to the second mark when the outside temp is under 40 F and then work normal the rest of the day, another 2 div swing on the gauge all the time, a 180 that controlled at 155 F. They can make them for gas though.

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post #9 of 9 (permalink) Old 06-06-2010, 10:16 PM
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Never cared for a Stant in a Cummins. OEM works better for me.

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