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Tomcat

Coolant bleeding problem

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So I'm on position 2, heater on max temp and fan low, both bleeding screws and expansion tank cap off. Tank 3/4 full.

 

What would cause the circulating pump to come on only intermittently, running about 5 seconds on, 30 seconds off. Every run it bleeds a bit of air, followed by a bit of coolant.

 

The circulating pump should come on and stay on. I'm really puzzled. What gives?

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Which engine pal, petrol or diesel?

 

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6 minutes ago, Tomcat said:

Car is a petrol 2.2l. Left it for half an hour and when I came back, it was pumping continuously. I wonder what that was...

 

With or without the engine running?

 

If ignition on, the coolant will circulate

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