Overheating Colorado

[Reggie1]

I have a 1999 Colorado diesel Auto and it always overheats when i go above 70 mph, it qucikly cools back down to normal running temperature when speed is reduced. Can any one tell me what the problem is?????? :)

[Andy]

I have a 1999 Colorado diesel Auto and it always overheats when i go above 70 mph, it qucikly cools back down to normal running temperature when speed is reduced.  Can any one tell me what the problem is?????? :)

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Have you checked the Viscous fan, if it's not working properly this could cause those symptoms, also give the rad a flush out and fit new thermostat and rad cap.

http://www.landcruiser-rocks.co.uk/index.p...pBB2&file=index

[Reggie1]

I have a 1999 Colorado diesel Auto and it always overheats when i go above 70 mph, it qucikly cools back down to normal running temperature when speed is reduced.  Can any one tell me what the problem is?????? :)

←

Have you checked the Viscous fan, if it's not working properly this could cause those symptoms, also give the rad a flush out and fit new thermostat and rad cap.

http://www.landcruiser-rocks.co.uk/index.p...pBB2&file=index

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Many thanks, will try,