OVERHEATING

1978 Datsun 510

Tiny

swoop0413

August, 16, 2009 AT 3:00 AM

Engine Cooling problem
1978 Datsun 510 4 cyl Two Wheel Drive Automatic 128000 miles

My Datsun has a tendency to have heat spikes while passing on the freeway. It runs a little hot all of the time as well. It has plenty of coolant, and the bottom hose is hot, so I know the thermostat is working. It also has a cracked exhaust manifold, which I am in the process of replacing. Could the exhaust manifold be causing the spikes and the high running temperature, and if not, what could it be?


http://www.2carpros.com/forum/automotive_pictures/397007_datsun_1.jpg

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