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The Hummer Knowledge Base
ATF in Air Filter:
I have noticed that there is transmission fluid inside my Air filter. Why? Where is coming from??
IMPORTANT: ATF in the air filter indicates that the cooling loop in the t-case has failed, and the transmission is pumping ATF into the t-case. Once the t-case fills, the excess goes to the hubs, differentials, and then the air filter (and belive it or not, a small amount is actually recycled to the transmission!) This needs to be fixed ASAP if it has happened.
- Check your transmission fluid level. If low fill it to the proper level.
- Temporarily remove the t-case cooler from the transmission loop. Plug the lines from the t-case so that dirt doesn't get in the t-case.
- Check for ATF contamination in the hubs, and differentials. If there is any contamination, do an oil change.
- Get the t-case cooling loop repaired.
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