Wonder have I a head gasket issue.
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Here's the story.
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MR2 MK1A is only used for car shows
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& vintage runs.
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When I return from a run the engine has pushed out about 2 inches of coolant into the expansion bottle.
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But when it cools down it only takes back about half an inch of coolant to the engine.
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Normally I just syphon out the coolant from the bottle the following day
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& pour back into the filler neck
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& repeat after every run.
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Compression is perfect in each cylinder
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& radiator, thermostat, filler cap
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& expansion cap have been replaced.
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Coolant has been bled correctly
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& idle is perfect
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& no sound of air in the pipes.
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I got my mechanic to detect any exhaust gasses in the coolant using his kit
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& nothing detected.
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Pressure must be getting into the cooling system.
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Not sure why the coolant isn't being pulled back into the engine.
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New cap is
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.9bar.
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Did a 60 mile run last Sat in quite hot weather
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& extra coolant was pushed out to expansion bottle
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& a little taken back.
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I found this time that I couldn't return the same amount of coolant to the filler neck so I'm guessing that there must now be some air in the system.
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I have a mark on the expansion bottle just above half way so I know what my starting point is.
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Anyone got any ideas?.
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Might be a head gasket job over the winter.
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Thanks,
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Tim