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Losing coolant after full throttle run
My son-in-law just picked up an '06 F250 crew cab short bed. I'm helping him with research on issues with the 6.0 Powerstroke. He has had the truck for about a week and called me today because it is pushing out coolant after full throttle acceleration.
The truck is bone stock except for 33" tall tires. When he test drove it he romped on it for a short distance and on returning to the dealer he noticed a puddle of coolant forming. They popped to hood and it was coming from the reservoir cap. They thought someone had probably not tightened the cap properly. He got on it again today and ran it up from 60-90 mph and it puked coolant again from the reservoir cap.
We're concerned it might be a blown head gasket. Any thoughts on most likely causes for this coolant loss?