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Q: Coolant System Repairs on 1999 Mazda B3000

I replaced the radiator since the original began to leak. I replaced the thermostat at the same time. The truck began to overheat immediately after that replacement. I thought it could be the new thermostat since the temperature gage would show that after the engine began to warm up, the temperature would appear to go all the way back down past the C on the gage and would then spike up to the hot mark far enough to make the check gage light flash on, but would then go back to about the normal setting. I replaced the temperature sensor just to make sure the readings were correct. I then went to Mazda and got a new thermostat from the dealer. It will still begin to warm up, then the gage will recede toward the C on the gage, then spike upward, although not far emough to make the check gage light flash. Earlier this week, the cooling reservoir hose actually got forced off of the connection at the radiator cap. I put a clamp on it. The next day, the lid was blown on the reservoir and it appears to have tried to split at the seam since it will now produce bubbles along the seam. What am I missing? I had the waterpump replaced last winter not long before the old radiator developed the leak. I also tried 2 new radiator caps just because I didn't know what else to do. Any suggetsions would be greatly appreciated at this point.
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you have a blown head gasket creating excessive pressure in the cooling system from a prior overheat. take it to a shop to confirm and get a bid.

Thanks for the tip. That could explain how the reservoir hose and the reservoir cap could get blown off and how the tank ruptured without the temperature gage indicating that the engine was overheating. I didn't realize that was even a possible cause for my problem.
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