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Coolant problems

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Steveb4BMX | 11:51 Tue 30th Mar 2010 | Cars
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On my Corsa C 1.2 52 plate the collant pipes dont get hot and the heater blow cold. I've replaced the thermostat but unable to remove the air lock. Any ideas thanks Steve.
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Steve, take cap off expansion bottle while engine is cold, then run engine until normal temperature leave for 15-20 mins but keep an eye on coolant level, dont let it get too low, then just add water when needed. This should get rid of the air lock.
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Take thermostat out and run at 3k rpm for a few mins. Gets the water circulating faster then pulling out any air locks and blockages.

Check 2 pipes going into the bulk head are equally warm and the same temp along the entire length. Sometimes the matrix gets blocked stopping the water circulation.

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