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Showing results for tags 'air bubble'.
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I recently replaced the radiator and added an overflow bottle in my '75 280z. After refilling the system with coolant, I took her for a test run to check for any leaks. The temp gauge was reading good - about 5/8ths...then the gauge dropped to the bottom of its range. I checked the connection on the temp sender and topped off the coolant and took her for another spin. Again the gauge was reading good then stopped working again. I let the system cool again and took off the radiator cap to add more coolant, but the coolant was at the top of the radiator. Would an air bubble in the thermostat housing cause the temp gauge to not register?
