Don't assume that a code that is related to the EGR system is necessarily the EGR Valve At Fault.
The computer on the 1997 Chevy Venture is located inside the engine air filter. The computer is surrounded by a semi-clear white plastic coolant reservoir.
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You need to clear the codes with a engine scanner.
The radiator cap on a 2001 Chevy Tahoe is the clear plastic one on the recovery tank. The recovery tank is actually a pressurized part of the cooling system.
The exhaust system may have filled with oil and coolant when the head gasket went. It will clear in time if that is the case.
1st repair the problem 2nd Use the scanner to clear the codes set in the computer system
Did you remember to clear the codes from the computer? OBD II systems have the ability to retain trouble codes even if the battery is disconnected so you will need a code scanner to retrieve the codes to have them cleared out so the computer knows the problem has been addressed.
Disconnect the battery for 15 minutes. It will clear the codes but will not solve the problem. Best thing is to have the codes read to find a solution.
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you need to take it to the dealer and have the computer flashed. this will clear the code and the light.
You could have a bad thermostat....mine wasn't moving at all and the fan would come on at start up.Make sure to clear your computer after you change it.
You have to clear the computer of the malfunction; Use the same diagnostic tool that read the code to clear the light.