coolent probs. - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 16 (permalink) Old 12-24-2007, 02:36 PM Thread Starter
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Thumbs down coolent probs.

hey all just installed my new 4" exhaust (made my-self), now i am having trouble with it getting hot, i can be going down the road at 55 mph and 1800 rpm and have normal temps.(around 190) then i go 1 mile at the same speed/rpm and the temp. will jump to 220, go another mile and back to 190/ 200....If drive more aggressive and get on it , it runs cool but when i back off the temp gauge will shoot up then go down in a min or two.
correct me if im wrong but I know the exhaust probly is not makeing it do this but mabee the thermostat? or fan clutch?

please help!!!:HITFAN:

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-94 chevy 2500 6.5 diesel,4x4, hypertech chip, 40 hp injectors, new inector pump, 4" exhaust 3"down pipe, #9 resestor, ported and polished heads and intake, eagle allows
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post #2 of 16 (permalink) Old 01-31-2009, 01:58 AM
 
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Check the T-stat and coolant level.
I would also check the grounds.
95% of my electrical calls @ work are bad grounds.
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post #3 of 16 (permalink) Old 01-31-2009, 11:40 PM
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Most likely T-stat...

You may want to pull the rad out of the truck and give it a solid pressure washing to clean all of the leaves and grit out of the fins....

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post #4 of 16 (permalink) Old 02-01-2009, 04:52 PM
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head gasket starting to leak,.
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post #5 of 16 (permalink) Old 02-01-2009, 10:24 PM
 
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Quote:
Originally Posted by chrisk1500 View Post
Most likely T-stat...

You may want to pull the rad out of the truck and give it a solid pressure washing to clean all of the leaves and grit out of the fins....
I do not recommend pressure washing a radiator!!

BAD IDEA!!

What will happen is the tiny little fins will get bent over and the rad will be JUNK!

However running a garden hose ( no nozzle) over it from the backside (maybe with some detergent from a sprayer or gunk engine cleaner) will work wonders for removing garbage from between the fins.

Last edited by TECHLINETOM; 02-01-2009 at 10:25 PM. Reason: can't type worth a @#%^%$!
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post #6 of 16 (permalink) Old 02-01-2009, 11:53 PM
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Quote:
Originally Posted by TECHLINETOM View Post
I do not recommend pressure washing a radiator!!

BAD IDEA!!

What will happen is the tiny little fins will get bent over and the rad will be JUNK!

However running a garden hose ( no nozzle) over it from the backside (maybe with some detergent from a sprayer or gunk engine cleaner) will work wonders for removing garbage from between the fins.
Well you don't use a 0* nozzle!

A good pressure washing with a wide nozzle is what I use on these, and all other rads I clean out in our fleet....don't spray at an angle and you won't bend any fins....

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post #7 of 16 (permalink) Old 02-02-2009, 08:11 PM
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Quote:
Originally Posted by big peter View Post
hey all just installed my new 4" exhaust (made my-self), now i am having trouble with it getting hot, i can be going down the road at 55 mph and 1800 rpm and have normal temps.(around 190) then i go 1 mile at the same speed/rpm and the temp. will jump to 220, go another mile and back to 190/ 200....If drive more aggressive and get on it , it runs cool but when i back off the temp gauge will shoot up then go down in a min or two.
correct me if im wrong but I know the exhaust probly is not makeing it do this but mabee the thermostat? or fan clutch?

please help!!!:HITFAN:
That seems a bit Hot Mine Floats between 175*F n 185*F depending on how hard its getting pushed Load Very heavy drive hard with OD off it may get as hot as 190 never seen it hit 200+. . .

I would check out the T-state and the Coolant levels the lower Radaitor hoses on them things leak, Right in that plastic oart where the Snaller hose splits off the had to the Oer flow/Radaitor Cap. . .:Took me a while to find the leak as it would never leave nothing on the ground but every 1500-1700 miles it would throw a low coolant light. . .I have the hose i'll be fixing mine this spring. . .

Mike

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post #8 of 16 (permalink) Old 02-03-2009, 05:58 AM
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I just fixed a 6.5 for a friend that was constantly doing the same thing. The kit from SSdiesel is a nice one with the duramax fan dual t-stats and higher flow water pump you'll never come close to getting hot again... Unless you have a head problem such as cracked heads or blown head gaskets but to check for that you can pressure test your cooling system or let your truck get up to temp and with the coolant fill cap off see if you have bubbles in your resivior or if you have excess pressure if you hold your hand over the cap hole and remove it.

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post #9 of 16 (permalink) Old 02-06-2009, 08:16 PM
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You have no sig but under your username it says 94 so I'll assume you have a 94. 94=single thermostat. replace it witth factory gm from stealer rape 40$. Do not use autoparts one. GM AC/Delco only.. If it has an aftermarket one in it that is most lileky your problem. Start there.

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post #10 of 16 (permalink) Old 02-09-2009, 01:26 AM
 
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I generally use a Robertshaw 330 series.
Also sold by Mr Gasket, Milodon, Stewart, and Brassworks (Flowcooler).

These are pressure balanced and high flow too.

P.S. No offence Chris but I'm VERY careful of what I tell people( can't make any assumptions as to their mechanical aptitude). It can get ugly quick.
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