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Old 09-08-2010, 10:02 AM   #1
knox
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CUMMINS BIG CAM IV OVERHEATING. .

I am running a 1987 big came iv low flow cooling and is currently giving me a headache. .Its overheating whenever it exceeds 40km/hr laden or unladen.Have changed water pump,locked the clutch fan to engine speed,redone radiator and got thermostats removed by the mechanic and never replaced.Now the truck is overheating above 40km/hr.what could be wrong???
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Old 09-08-2010, 10:30 AM   #2
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Quote:
Originally Posted by knox View Post
I am running a 1987 big came iv low flow cooling and is currently giving me a headache. .Its overheating whenever it exceeds 40km/hr laden or unladen.Have changed water pump,locked the clutch fan to engine speed,redone radiator and got thermostats removed by the mechanic and never replaced.Now the truck is overheating above 40km/hr.what could be wrong???
Not sure what you mean about 'never replaced".....did he replace them or what?

I would put money on the baffle being broken in the bottom of the radiator. There's a small baffle that the low-flow system uses...that's known to come loose and cause heating problems. Ask a reputable truck radiator shop.
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Old 09-09-2010, 02:20 PM   #3
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AND CHANGE THE THERMOSTATS-its a cheap repair to prevent a big problem.
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Old 09-09-2010, 05:54 PM   #4
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If you have an infrared temp gun you can usually measure the radiator temperatures and tell if the coolant is flowing properly threw it.
You can test the thermostats for proper operation at the same time with the temp gun.
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Old 09-09-2010, 06:53 PM   #5
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By tommorow I should have an update.Thanx all
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Old 09-11-2010, 05:08 PM   #6
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Guess what. . after replacing the thermostats it began to run normal.

Many thanx all.
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