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GMC Yukon: I have an 05 Tahoe with the 5.3l engine that's running

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I have an 05 Tahoe...
I have an 05 Tahoe with the 5.3l engine that's running hot. I've had the heads surfaced and checked, and they tested good. Replaced head gaskets and intake gaskets, still run hot within 20 minutes of idling. New water pump and thermostat, no change. A/c fan works, but coolant fan doesn't, but has bn like that for a while but just started running hot. It gets hot to the point of pushing coolant back out of the coolant tank.
Submitted: 1 year ago.Category: GMC
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Answered in 51 minutes by:
4/20/2016
GMC Mechanic: mike switzer,
 replied 1 year ago
mike switzer
Category: GMC
Satisfied Customers: 717
Experience: lead diagnostic tech at Aamco
Verified
have you checked your radiator cap. if the cap is bad and not holding pressure it will allow the coolant to boil at a lower temperature causing air pockets. and reservoir overflow.
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