Finally joined, trying to do more things myself. I did the egr pipe, valve and cooler cleaning. After it was back on and I added some coolant, I started the car and the coolant light was on and hasn't gone off. I checked the coolant temps via my obd2 reader app on my phone. It shows what appears to be normal/good temp range even when driving and a/c on. Had thought I possibly did something to the temp sensor, but the readings look good though. Are there more than 1 temp sensor for this light? Any ideas appreciated, thanks.
There are two temp sensors, one on the drivers side of the engine under the egr and the second on the exhaust recirculation hose next to the master cylinder.
If you haven’t: be sure to clean intake manifold too; it has EGR passages. See top two links in my signature for more info (on a phone turn it landscape to see signatures). what’s the miles?
Thanks rjparker, I'll check another app and see if I can see them both. Thanks Mendel, 238k, I did clean the intake manifold. Probably should have checked the injectors, oh well. Might have fouled up the lower temp sensor with fluid. I have had stumbling on startup once in a while and cylinder 3 spark plug looks clean clean, figured not a good sign for hg issue. Background: Bought it used about a year ago, should have done the cleanout of the egr/manifold stuff right away, oh well. Also, turns out it had a weak fuel pump which gave a lean burn condition code which i think accelerated wear out of the cat since i didn't find/swap it out right away. So ended up changing that earlier this year. It ran okay temp wise whenever I would use the obd2. Probably should have checked/replaced the water pump when I first got it as well. Trying to live and learn
