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Old 09-16-2007, 08:51 PM   #1
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I'm looking for some specs that show the ranges of operating temps for my MH. I drove from so cal to Las Vegas this summer when the outside temp was hot at about 105 F and the MH temp averaged between 210 to 225 with a 180 thermostat at about 228-230 the fan clutch kicked in but only dropped the temp around 5 degrees. and pulling the hills I was very easy on the pedal but still the temp climbed to about 230 and if I pushed it a little it wanted to climb over 230. I'm worried that I will overheat and pop a head gasket if I get to hot. My MH has a newer radiator, fan clutch and water pump. All are about 3 years old. Any info would be great. Can the 454 guru's help. Thanks Chuck
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Old 09-16-2007, 08:51 PM   #2
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I'm looking for some specs that show the ranges of operating temps for my MH. I drove from so cal to Las Vegas this summer when the outside temp was hot at about 105 F and the MH temp averaged between 210 to 225 with a 180 thermostat at about 228-230 the fan clutch kicked in but only dropped the temp around 5 degrees. and pulling the hills I was very easy on the pedal but still the temp climbed to about 230 and if I pushed it a little it wanted to climb over 230. I'm worried that I will overheat and pop a head gasket if I get to hot. My MH has a newer radiator, fan clutch and water pump. All are about 3 years old. Any info would be great. Can the 454 guru's help. Thanks Chuck
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Old 09-19-2007, 06:27 PM   #3
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I have a 94 454 in a 30' class A and it runs about 190 most of the time. If it is hot outside it will criuse flat at 210.

For long hill pulling, I installed an aux trans cooler with its own fan. I plumbed it into the system prior to the fluid going to the radiator cooler. If the trans fluid is cooled prior to running into the radiator cooler,it puts less work on the radiator to cool. I wired a switch to the dash and turn the aux trans cooler fan prior to pulling a long grade. It has helped a lot.

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Old 09-19-2007, 07:18 PM   #4
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One question 2,3,4 or6 core radiator?? When I replaced mine living in Arizona, Took the 6 Core. Running hard climbing 9+ grade running 210 F. I also added two front fans on mine to help the cooling and for the A/C too.
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Old 09-21-2007, 06:08 AM   #5
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It sure sounds like a radiator problem. I agree with Cap't dan, count the core and use the biggest radiator that you can find. The trans cooler trick also works but if the core is undersized or has built up internal deposits speed and load will raise the temperature. The 454 engine is designed to operate with a 190 degree thermostat and run between 200 and 210 degrees.

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Old 09-24-2007, 06:44 PM   #6
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Thanks for all the great ideas. the radiator is a 4 core also my MH has only one trans cooler that is plumbed before the radiator. going to flush the radiator and see how that does first.
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