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1500 5.3L z71. trying to help a friend out and running out of things to change.

truck runs hot while towing. 2 miles and its done. let it sit, comes back down to normal temp.

new cats, new muffler, new fuel pump, radiator, water pump, new clutch fan. pretty sure he has changed all the fluids as well. truck still runs hot while towing. had it hooked up at the dealership and tech II shows its hot, but no cel or codes, AFAIK.

unhook trailer and you can run it wide open and will not over heat. drive it anywhere. hook a trailer, 2 miles its running 250 degrees.
 

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Creepy Ass ******
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5,801 Posts
How is the airflow through the condensor? Should be able to lay a fender cover in front of the grille and have it get sucked against the grille at idle.
 
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