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Old 09-08-2018, 10:41 AM   #26
oldgold70c10
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Join Date: Feb 2006
Location: Morrison, Oklahoma
Posts: 1,023
Re: 350 Heating Up at Stops

What does your coolant look like? Are you running plain water or coolant mix?
Even if it does not get cold where you live to worry about freezing you need coolant mix for the corrosion protection. If the water is brown or the coolant is not bright green, flush the system before you do anything else. Scale and sludge in the radiator and engine water jackets will rob you of cooling capacity.
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1969 C10 LWB W/ 250 I6 & 3spd
1970 C10 with '67 small window cab, 68 front end, blue; 305/TH350, 3.08 limited slip rear end, manual brakes, power steering; & 4-wheel drums-My daily driver.
1975 Chevelle Malibu Classic Coupe 350/th350 mint green
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1983 GMC 1500 Sierra 305/SM465 2.73 rear end

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