Having problems with your 1999 Oldsmobile Silhouette ?

Replace t-stat on 3400 - 1999 Oldsmobile Silhouette

Posted / edited by AnonymousUser on : 24-07-2017

Answers :

The best way to find a thermostat is to follow the top radiator hose but some are located at the bottome radiator hose on the block of the engine...but when u located it make sure u study how it looks before you take it out and watch which way it is facing you should put the new one back in the same way you took it out...but when you take the old on out, make sure you check for the old gasket or ring which ever one you have and make sure its removed...ok place the new gasket and line it up with the screw holes then place the themostat and silocone should be used as well to make a sure seal...make sure everything is aligned just right and but the thermostat housing back on and make sure each bolt has a snug to them when you tighten them the smallest little crack will cause a big leak but when tightning the bolts, alternate each bolt tighten this one a bit then tighten the other a bit just like that and then top off the lost water or antifreeze then you have changed your thermostat
Hello Doug.
Be prepared to have lots of patience on this one. Tricky to do and have some good tools.A 10mm ratchet wrench is nice to have on this too.
Remove the air cleaner and duct pipe. The exhaust crossover pipe is in the way but it will come out of there without removing it.
Drain your cooling system down to below the level of the thermostat housing.
Now comes the fun part. Remove the clamp on the housing and remove the 2 bolts holding down the housing. Make sure at this point your tools are capable of removing the bolts before loosening.
After removal clean up the surfaces. I use some weatherstrip adhesive to tack the thermostat and gasket to the housing normally but in this case you need to put the thermostat in the block first and then slide the housing in. You need to be cautious here as the thermostat can slide out of position and if so you tighten the housing it will crack it.
After you get it together and refill the system the next thing to get done is to get the air out of the cooling system.
There are some air bleed screws one on the housing and I think there is another one on the engine. Open these as you refill to allow air to escape, close when coolant comes out. Run for a couple minutes, shut off, and crack them slightly again, top up. Run to operating temperature, let it cool again and check your levels.
Hope this helps you along.
Repair Help & Product Troubleshooting for 1999 Oldsmobile Silhouette

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