Having problems with your GMC Sonoma ?
All of a sudden I am getting an overheat indication on the temp gauge in my 1996 GMC Sonoma 4cyl Blower is blowing cold air, Top radiator hose is HOT, heater hoases are cool to the touch. Lower radiator hose is just warm Put in a new thermosat last fall. Engine starting rouning rough on startup but smoothes out after run for a short time. I think the heating problem is a faulty thermostat, Your help is appreciated
Take the thermostat out and put it in a small pot and heat it on the stove top watching to see if it open when it gets hot. If it hasn't opened all the way by the time it boils its bad
Repair Help & Product Troubleshooting for GMC Sonoma
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