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2001 suburban over heating at higher speeds

cgates1cgates1 Member Posts: 3
edited January 2017 in Chevrolet
Hi I'm having issues with my suburban we just had tranny worked on last week. When we go 60 mph or faster it over heats real quick unless we out heater on full blast. It drives nice with no issues in town anyone know what could be wrong with it
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    cgates1cgates1 Member Posts: 3
    Unless we have heater on full blast 
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    Mr_ShiftrightMr_Shiftright Member Posts: 64,481
    Overheating at high speed is usually a coolant circulation problem, not a cooling fan problem. So you might have thermostat issues, clogging in the cooling system, air in the cooling system.
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    ray80ray80 Member Posts: 1,655
    First thing I would check is coolant level, both overflow and radiator (if it has normal cap). After that perhaps T-stat or water pump issue. What year and how many miles on it?
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    cgates1cgates1 Member Posts: 3
    Around 180,000 2001
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    ray80ray80 Member Posts: 1,655
    Hhmm Getting up there in age. Cooling system flushed and refilled at reasonable intervals. Dexcool or compatible still being used, or was it switched to older type coolant at some point?
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