PaPaDuck

When I start my 1993 Corvette cold, I can hear the sound of a fan blowing. I lifted the hood with the engine still running . The sound is coming from a small fan located in front of the left front wheel well below the headlight. It is not one of the cooling fans. They are not running. The engine is still cold. This small fan has a air duct attached. The duct is approximately 1.5 inches in diameter. What is this fan and what controls it?

WVZR-1

The fan is the SECONDARY AIR pump - an emissions device. Check a '93 FSM for proper operation.

PaPaDuck

Thank You for the info. Will check troubleshooting for that air pump to see what is making it run at startup.

jmgtp

It's supposed to run at start up. It pumps fresh air into the exhaust system upstream of the catalytic converters to bring them up to temp faster. It's strictly for emissions and should shut down a short time after a cold start.

L.V. Vette

What years had these? Don't remember seeing one on my 91

jmgtp

I believe all LT1 have them, those cars are 92-96. I think LT4s have them as well but not positive. Unsure of the LT5 and I thought L98s had a belt driven air pump.