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What else could be causing my car to overheat?
2003 Buick Rendezvous CXL. Just replaced the thermostat, cooling fans are working, I have no heat/ac air inside car and it still seems to be overheating. from the C to the H their are 3 lines mine tends to hit that 3rd line in just a matter of minutes. So is their a fix? and why do you think my ac/heat does not come on? Are the problems related?