ECT replacement: 30 to 60 minutes. ($95/ $215 / $390)
Best tool for the job: https://a.co/d/2HMWrEd
WARNING! If you strip one of the T40 screws on top of the thermostat housing, do not try to use a hammer and try to hammer a tool into one of those screws in an attempt to get a better bite in the screw. If you do, you will likely crack the lower thermostat housing and turn this 1-hour job into a 5-day job. Many people have tried and most have failed. If you strip one of those T40 screws, use this link to view a video on how to to remove that strip screw: https://youtu.be/kl8oQoItmZk
NOTE: I now replace these bolts with bolts from the water pump or intake manifold.
PN: 9186486
PN for the 850, x70 cars from 1993 to 1998: 9186486, Thermostat: 271664
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Disclaimer: https://www.youtube.com/watch?v=SLPVaRK9sDU
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Basic car care YouTube channel: https://www.youtube.com/user/rspiwin
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I used the socket on the extension method to loosen that rear fastener on my '97 850 T-5. Works like a charm. Thank you!!