Having problems with your 1997 Oldsmobile Cutlass Supreme ?

Where is the thermostat - 1997 Oldsmobile Cutlass Supreme

Posted / edited by AnonymousUser on : 08-08-2022

Answers :

The thermostat in the 3.1 engine is in the thermostat housing. Follow the upper radiator hose towards the engine, where the hose connects to the engine is the thermostat housing which leads under the throttle body. Yup, it's not the easiest thing to get to unless you have small hands and a few socket extensions and swivel. If you have small hands you can remove the thermostat housing without removing the throttle body. Just remove cross over exhaust heat shield to give you enough room to get the socket with an extension and swivel to the two bolts to the thermostat housing under the throttle body. Remove front bolt and the second one just needs to be loosen and you can wiggle out the thermostat housing to replace the thermostat. If you need more room, your going to have to remove the throttle body and replace the throttle body gasket also to give you more room to get the thermostat housing out. Good luck and hope this helps and take care not to damage the temperature sensor on the manifold just in front of the housing. Keep me posted if you have any more questions and take your time. 
Follow your top radiator hose to the engine, there you will find the\015\012cover with two bolts and inside should be your thermostat. as far as my\015\012memory goes, until the arrival of imported $%&((&$ all\015\012thermostats were connected to the top radiator hose. This allowed for\015\012the coolant to flow from the engine back into the radiator once it had\015\012reached a proper operating temperature to be cooled and then out the\015\012bottom hose to the water pump and back into the engine. When removing\015\012this cover, care should be taken not to damage the cast iron part.\015\012Replace the the thermostat in the same manner you took it out, making\015\012sure you have a clean surface for the new gasket.

now i will give you the steps to replace a thermostat also......
First thing I can tell you is give yourself plenty of time to do this\015\012simple job. Its not really difficult but can be especially trying if\015\012your time is limited. Change the thermostat when the engine is cold.\015\012Drain about 3 quarts of coolant from the cooling systen and save it.\015\012Remove the air intake hose from the filter canister to the throttle\015\012body.( 2 clamps ) Remove the throttle cable and cruise cables by gently\015\012prying them off the throttle body butterfly arm. Remove the spring\015\012between the throttle body arm and the throttle cable bracket. Remove\015\012the (10mm nut) from the rear of the bracket. ( its on a stud used where\015\012the egr tubing attaches ) Remove the 2 8mm head bolts from the bracket\015\012near the front where it attaches to the throttle body. Remove the 13mm\015\012nut (using a socket) from the bottom of the throttle bracket attaching\015\012it to the manifold. As I remember there possibly is another bolt near\015\012and to the rear there also. Remove the clamp holding the fuel lines to\015\012this bracket. You shuld now be able to remove the throttle bracket and\015\012set it aside while getting to the thermostat. There are 2 bolts holding\015\012the thermostat housing in place. The easy one is forward top and can be\015\012reached with a short socket (13mm) and wobble extention or universal\015\012joint. The trying one is to the rear and lower. There is very limited\015\012space between the 13mm bolt head and the exhaust crossover pipe. The\015\012bolt is very trying to remove and get started again. Fortunatly the\015\012lower mounting hole of the thermostat housing is usually slotted. Using\015\012a 12 point 13mm box wrench, (or better yet if you have one) a 13mm\015\012crowfoot, back out this bolt as far as you can without removing it.(\015\0121/12th of turn at a time ) With some aggravation and manuvering the\015\012housing will come off and out with the thermostat staying in the\015\012manifold. If the thermostat tries to come out with the housing the\015\012housing can't be removed due to space limitations. Use a screwdriver or\015\012simular small tool to hold the thermostat in the manifold cavity until\015\012the housing is free. Now the thermostat and rubber sealing ring will\015\012come out. The rubber ring usually comes with a new thermostat so no\015\012gasket is requred. As ALL the manuals read\015\012" REVERSE PROCEEDURE TO INSTALL " Good Luck, hope this helps!
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