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Q: Major coolant leak

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I turned on the AC and smelled coolant. The truck then stalled. I opened the hood and saw coolant coming down from the hose on the firewall. There was also coolant all over the engine.

It sounds like your truck overheated and caused it to turn off. One thing that could cause it to overheat would be a bad thermostat. I would recommend having the thermostat replaced and make sure there is coolant in the radiator.

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