C6 Transmission overfill drain valve.July 29 2012 at 2:23 PM
|Pete Resson (no login)|
from IP address 184.108.40.206
Response to Re: C6 Transmission Vent Tube
This car sits in the parking space for two months at a time, without being started or driven. The car is parked on a slight hill, the front of the car is facing down the hill (lower than the back of the car). I notice a small puddle of transmission fluid under the car, when it sits for a couple of weeks, it is coming from the front of the transmission oil pan. It is definetly not leaking from the front pump seal, gasket or O-Ring, since these parts were already replaced. It does not appear that any other seal on this trans is leaking. The trans pan gasket has already been replaced and the pan and trans pan flange on the trans were inspected (but I did not exactly inspect these parts close enough myself), the mechanic said that he did, so i am not going to rule out the possibility, that it is not still leaking from the trans pan, because it might be leaking from there, from a small dent or divot at the front of the trans pan gasket sealing surface/flange. There was a small dent there in the front of the trans pan and it was recently flattened out. Which brings me to my question: I have heard that these C6 trans torque converters sometimes drain back into the trans pan, when the car is not started for a couple of weeks, and that the fluid can be leaking from the overflow valve at the top of the transmission. But then i would think that these transmissions were designed with enough reserve capacity in the transmission pan, for converter drain back. Is it possible that it could be leaking from the overfill valve? I always check the fluid level and it was not over filled. This car recently sat for five months without being started and it leaked a total of two quarts of transmission fluid into the plastic drain pan underneath the transmission pan, which would lead me to believe that it is the transmission pan gasket/flange sealing surface that is still leaking.