1988 GMC Suburban overheating

1988 GMC SUBURBAN
200,000 MILES • V8 • 4WD • AUTOMATIC
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my temp gauge goes all the way up, after minute it goes back down to mid way, radiator is half empty daily, chugs a little at higher rpms, blows white smoke at idle once that i have noticed and i have changed thermostat and gasket
May 28, 2010 at 4:41 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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