i have a 2001 olds alero 3.4 V6 and the thermostat on mine is underneath the throttle body...this may vary from your '99 vehicle, and it also may vary depending on your engine size
The thermostat is located on a 2003 Oldsmobile Alero in the thermostat housing. The thermostat housing is located on the rear side of the engine block.
you need to remove air filter and some of the exhaust pipe before u can get at it.
Could be thermostat not opening causing a back pressure
what dose a 1999 Alero transmission look like.
1999 Alero how do i test ignition coil pack
Thermostat, low coolant, inoperable fan, exhaust leak close to engine bay
Rear of engine, underneath the exhaust manifold. you can follow the coolant line (approx. 2") tha runs underneath your engine, then runs up the back of the engine, up to the thermostat.
how do you replace head lights on my 1999 oldsmobile alero?
How do you change rear wheel bearing on 1999 alero?
Its on the engine near the thermostat
beside thermostat