So I swapped out my water pump, thermostat, installed an electric fan and I am overheating. The fan is working... I even turned it on manually and drove around and the temps still rise up.. I let the truck sit and idle with the cap off of the reservoir for about 20 min to get air out (thought that would be the issue) but nothing. I can let it sit on idle for 20 min and truck will not get hot. But right when I drive it for like 15 min temps go way up... Any ideas????
Cooling issue. (Help)!!
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I would start by looking at the thermostat. Is it defective or maybe backwards- not sure if it is possible on Lightnings but have seen it on other cars. Other thing I would check is that your fans are blowing/sucking in the right direction.
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2,428 Posts
Sounds like thermostat.... Sitting still your fans are cooling. Usually if you overheat while moving it is a bad thermostat
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What condition is ur radiator in? That could also be a concern. Had that happen on my old 98 cobra. Started driving and the temp would creep. Sat still it would cool down. Top hose was hot bottom hose was cool to the touch. Replaced radiator, got air out the system, all was well. Good luck.
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I've never been able to get the air out just idling. Always turned the heat on and removed the cap while reving it up some. With my new engine I removed the stat and did that until it reached operating temps. Then I let it cool down and put the stat in. Also where are you reading the engine temps from? That sending unit for the dummy gauge often fails and is inaccurate. If you can, datalog the temps and go off that.
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Don't trust the dummy gauge it will read normal all the way to 245 Lol
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