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questforbalance
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questforbalance's post in red lamp water flashing every second was marked as the answer
I worked on solving this problem today and so this is what I did:
I rechecked the new Engine Coolant Temperature sensor, inspected the wires and inspected the self adhesive tape I used to wrap the wires feeding the ECT sensor and the ECT (I wrapped everything up thoroughly). I then removed the B1 fuse from the fuse box just in case there was an air pocket left over from when I changed the front radiators three weeks ago. I opened the bleeder valve, cleared the DTC from the car's computer and bled the car all over again. I hooked up my hand held OBD2 reader and monitored the RPMs and engine coolant temperature sensor. After a few minutes the temperature sensor on the dash board starting working and indicating the coolant temperature. I compared the result with my hand held OBD2 reader. I spent a good 30-minutes reving the car and trying to bleed the coolant system. The car did not need any more coolant. I drove the car for about five miles and no codes returned, no flashing lights and the temperature gauge was working properly.
My theory is that the car wash may have shorted the ECT somehow and caused the coolant system to malfunction. Everything seems ok for now. Hopefully it stays this way. Thanks for everyone's help and I hope this posting helps others with the same problem.