flywheel Posted May 7, 2008 Report Share Posted May 7, 2008 Ok 1971 521 stock 1600 with a new webber. Runs grate, little low on power but not even a miss. Today I was in trafic when it started to over heat, So I headed back to the shop it was smoking a bit (Blue and was faint. Not heavy.) Then it stoped, The smoke and it cooled down. It was only missing a little water and the oil looks good.(no water in it) So I drove it home on the freeway. Trafic was good was doing about 70mph did fine. when I got to my house the oil looks a little high. Truck was cold sat for 3 hours. water was where it was befor. When I went to the store it was fine then it started to get warmer and the heat felt like it was blowing on low but it was off. Im thinking im going to lose a headgasket. any one deal with this befor? Thanks Quote Link to comment
yello620 Posted May 7, 2008 Report Share Posted May 7, 2008 Sticking thermostat causing your heat fluctuations? Super cheap to just replace it now to be safe, and if that isnt it you are only out about $6. Jaosn Quote Link to comment
datzenmike Posted May 8, 2008 Report Share Posted May 8, 2008 Don't think the '71s had clutch fans, my '72 didn't. If you suspect it may be the thermostat just change it, not worth putting an old one back in. Low speed overheating could be from lack of air flow. Is fan belt slipping? Is fan shroud installed? Is there leaves or plastic bag stuck to front of rad? Do you have anti-freeze/coolant in it? Could the rad be plugged with scale? A lean idle mixture will also cause the engine to run hotter at idle. Quote Link to comment
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