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Hi all. I have a '93 Surf with the 1KZ motor, and I live in Canada. Typical stuff happening, losing coolant and overheating. I replaced the t-stat, had coolant leaks repaired (in rad and transmission cooler), no change in operation. I'm suspecting head but here's my question. Today on the way to work it got hotter than usual. I pulled over, no heat out the blower fan which was weird. Popped the top off the rad and added about a litre of coolant and drove to nearest station and put in another litre and then added to the overflow. 50kms later I get to work and pull the cap off the rad, no coolant in the top of rad, no pressure as I take the rad cap off and the overflow is empty. Where's the pressure and where's the coolant? If the exhaust would be pressuring the coolant system from a crack, would my overflow be full when I stop? Obviously it's not sucking anything back in from the overflow b/c the system is still hot. Any suggestions welcome.