You'll need to get under the car to find it. Look for the transmission itself – it's a large, usually cast-aluminum or iron case, located near the rear of the engine.
* Automatic Transmission: The drain plug is typically on the bottom of the transmission pan. This pan is usually a relatively shallow rectangular box attached to the bottom of the transmission. The bolt will likely be a fairly large hex-head bolt, often magnetic to catch metal particles.
* Manual Transmission: Manual transmissions typically don't have a drain plug in the same way an automatic transmission does. Fluid changes on manual transmissions often involve removing the transmission's fill plug to drain fluid from the top. However, some later models might have a drain plug, usually towards the bottom, but less common than on automatics.
Important Considerations:
* Consult a repair manual: A repair manual specific to your 1990 Chevy Celebrity station wagon (including the engine and transmission type) is your best resource for the exact location and procedure. Incorrectly draining the transmission can cause damage.
* Safety first: Always support the car securely on jack stands before getting underneath it. Never work under a car supported only by a jack. Wear safety glasses.
* Fluid type: Be sure to use the correct type and amount of transmission fluid specified for your vehicle.
Without knowing whether your Celebrity has an automatic or manual transmission, I cannot give a more precise location. Use a repair manual or consult a qualified mechanic if you're unsure about any part of this process.
