yannbeam wrote:Hey Jim, do you think a bottle of Forte might help with the heater matrix untill I get time to llook at it in the new year ? I wont use 'Leak Fix' products, but I've heard good things about Forte and believe you yourself find it acceptable.
Yes, it's currently in Gabriel's cooling system and has staved off the day I must do the heater matrix quite well... I just get the occasional whiff now..
As Mike says, DEX II is the correct stuff for the gearbox... Do a few changes in quick succession to effectively flush as nearly half the total is trapped in the torque converter and only successive changes will flush it out...
Old DEX is often black and rancid... Nothing to be overly worried about if the 'box is working well.
Use proper mineral DEX II and don't be tempted to put DEX III or later in even though it's stated to be backwardly compatible. The 4HP14 and 18 don't seem to like the more modern semi and synthetic ATFs...
Also, clean the gauze filter which is easily accessible under a small cover in the gearbox sump...