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Cooling Systems, Radiators, Fans / A/C
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Old 04-20-2017, 07:46 PM   #1
Ruomatskram
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Default *Temperature Spike Question

I have recently put a lot of new parts into my 57 Deluxe Heater, many of which were missing when I bought the car. I put a heater core, control valve, hoses, cables, seals, and a blower motor. I never had a control valve before.

When I run the car with the heater control off, the temp spikes right up to 260 or greater, quickly, as if air was sucked into the top of the head at the sensor. When I open the heater valve, the car cools down and runs at 185-190, pretty normal. If I close it again later, I get the same spike in temp, again like air is present in the top of the head. (The engine does not overheat) What is malfunctioning to cause this condition?

I have the inline six. The cooling system has been flushed and refilled. New hoses. Old water pump. Checked and rechecked hoses for proper connections.

It operates just fine with the control valve left open. Any thoughts?
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Old 04-20-2017, 08:53 PM   #2
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You have air in the system. The heater is letting the air bypass the engine, but it's stays trapped someplace in the engine. Run the engine with the radiator cap off and the front end elevated as high as you can get it.
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Old 04-22-2017, 04:14 PM   #3
Ruomatskram
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Default Temp Spike Question.

Thanks. Makes sense. I know there is still air in the system. It hasn't taken in enough new coolant to account for the new core and hoses. About a pint to go. I'll try it!
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