I replaced a sometimes failing A/C radiator fan, after replacing the thermostat and both old upper and lower hoses. I had a slowly progressing over-heating problem also. There is also no apparent wet spot inside the car and on the floor under the dash, where a leaking heater core would create that mess. Of course, I also went through an industrial area. I also smelled a bit of a chemical smell towards the end of the trip but not during it. I had checked the antifreeze levels before I left but haven't checked after because it is too dark. I took a 70 mile trip today, and then it began overheating when I got off the expressway. The overheating also seems to happen in the pauses after long trips. Leak sealant seems to have helped the problem before, but I am not sure it is now. I've noticed the heater stops working a few days before the engine begins to overheat (so I put in coolant). The leak loses antifreeze over months but seems to be speeding up. They've let the engine cool for about 5 hours and pressure tested it. They've tested the oil for any traces of coolant. They've replaced the thermostat, the hoses connecting the radiator and the radiator cap. The problem is, I and two mechanics cannot find it. Since fall I have had a progressively worsening coolant leak.
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