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1990 Dodge Truck hot running at highway speed

Tiny
RAH
  • MEMBER
  • 1990 DODGE TRUCK
  • V8
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
My 1990 Dodge P/U has been running hot at highway speed for about 8 yrs. I have replaced everything that I know of the cooling system, radiator, hoses, thermostat, temp sensor, water pump, and fan clutch, all to no avail. Once the ambient temp reaches about 80 degr. It runs hot. I don't think a bad head gasket would last that long. There is no water in oil or vise-versa. Just had the cat and muffler replaced, half of cat was in muffler. Any ideas? I've asked 4 different mechanics and no one seems to have any other ideas.

Thanks in advance. RAH
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Monday, August 18th, 2008 AT 3:14 PM

1 Reply

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Is the radiator fa shroud in place? Test radiator cap< Do a pressure test on both the radiator, and the cap, something will lose pressure, and thats where the problem is. Unless the block itself is all gunked up.
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Monday, August 18th, 2008 AT 3:38 PM

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