check engine light, car running fine, code coming up coolant
I recently bought a 2004 Chevy Impala that had a blown head gasket so the engine was replaced. It ran fine on my two hour drive home right up until I pulled into my drive then the traction control light came on then shut right back off. There did not appear to be a reason for it. When I turned the car back on it was off and didn't happen again for a day or so. Then a couple of days ago the traction control light came back on and then the warning light came on along with the ABS light. When I stopped and turned the car off and then later on again they were back off and stayed off for a few days. But then my check engine light came on around the same time I replaced the gas cap. I switched back to the old gas cap to see if that made a difference which it didn't seem to. I looked more closely and noticed that there was a thick layer of dust around the opening which the cap seals to. I cleaned that off carefully and replaced the cap. Then went to auto zone a couple of days later and they said that it was reading as low coolant. It appeared that the coolant was fine but added a touch more to be sure since the fill line was near the level of the coolant. Light was still on. I researched bad thermostat and coolant temperature sensor. I am not seeming to overheat (I have been paying close attention to any signs) and the temp gauge inside the vehicle reads fine. The car is driven about 20-30 miles on the interstate in the mornings and afternoons with a bit of city driving in the afternoons when we run errands. We are getting about 26-28 mpg. We bought the car last Sunday so not a long history with it. Oh and I have noticed a couple of times that when I try to accelerate that the car will accelerate then seem to have a quick pause then continue to accelerate. That may just be me, though. It has only happened twice. Any ideas? I figured I would replace the temperature sensor and thermostat since those should be easy to do myself.
Traction control and ABS are completely separate issues from any coolant/overheating issues. That said, you appear to be on top of things as far as diagnosing/repairing problems, and you may want to take a look at this page on fixing the traction control/ABS issue (it's also on an 04 Impala): http://www.instructables.com/id/How-to-Fix-the-ABSTraction-control-light-on-a-04-I/
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