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hey sricci, i'd say it's about a 95% chance it's the head gasket and about a 0.002% chance of being a cracked block especially on a 22r. it might be a cracked block if it were like a chevy small block out of a firebird or something! i think if cold weather would happen to have been a factor you'd have come up with a leak somewhere else less insulated than the block like at the radiator. i had the same problem on a rebuilt 22r and it turned out it was where the machine shop had removed the timing chain cover while the head was attached and then when they went to put the timing chain cover back on they apparently forgot about the little bit of overhanging head gasket that's supposed to sit on top of the chain cover and just crammed it on while crushing the gasket in the process! well good luck!! do you also have oil in your coolant or just coolant in the oil?
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