heating up

[gm88]

latley ive been noticing that my truck heats up a little under hard acceleration. i have a 1999 c2500 5.7 4l80e with 110000 miles on it. usually when crusing on the hi way the temp gauge sits 1 small line past that middle big line btwn 100 and 210. Anyways last week after driving for about an hour i had to get on a hiway on ramp that sloped up hill. I put it to the floor from about 30 to 75 to get on infront of a group of semis. when i let off the gas at 75 i noticed the tep gauge moving towards 210 and eventually making it to 210 before slowly dropping down. Over the next week ive noticed even under moderaly hard acceleration (3000-3500 rpm) the gauge moves up a line or 2. I put a new radiator, water pump and upper+ lower radiator hoses in in april of 2009 at about 80000 miles. I also flushed the dex-crap out and replaced with green. No problems with it til now. Anyone else's truck do this?

 

Thanks

[00Silverado4x4]

Thermostat? Possibly not opening far enough/quick enough?

[gm88]

Im pretty sure the thermostat opens normally. Ever since i changed it (same time as radiator) The truck heats up to 210 then drops off suddenly through the first couple miles of driving.

[dodge123]

temp sensor? mine went out a month ago. Same symptoms as you. Easy to replace and fun

[pknoerzer]

It sounds more like a possible head gasket leaking.

[tommydurk]

Are you low on coolant? If not, them likely not the head gasket. Maybe something is clogged or restricted from the flush, or a hose is collapsing at higher engine speeds.

 

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