My 2007 Pontiac grand prix overheats on the freeway

Asked by Jun 27, 2017 at 12:30 PM about the 2007 Pontiac Grand Prix Base

Question type: Maintenance & Repair

my 2007 pontiac grand prix runs hot but only on the freeway, i have to turn
the heater on to get it to go down, what could be the problem? I did also
notice a few days ago that there is a brown sludge under the cap for the
radiator, i had checked my coolant, and went to check my water level and i
had never seen the brown sludge before til now, i know i need to do a
flush, could that be the only problem? Im on a budget so i cant afford to go
to a mechanic right now but i do have someone who can fix parts for me if i
buy the parts...

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