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Q: Location of the coolant fan switch? on 1991 Buick Park Avenue

My ex replaced my original radiator with one from Ecology (the junkyard). Its from a car that looked just like mine, but the difference in the radiator is that it has 3 rows instead of 2(i really dont know what that means,but thats the way my ex described it). It fits good and works really good, but the problem is that now my fans are not turning on! We connected them to the battery and they ran, so according to a general motors manual, it means that the coolant fan switch is defective. The fans worked just fine before he replaced the radiator, so could the problem be the difference in how many rows the radiator has? And the most important question we have is where exactly can we find this coolant fan switch? Again, the manual says its mounted on the intake manifold, near the distributor. Although not a certified mechanic, my ex is very mechanically inclined and has worked on many of my cars as well as his own and others', but e cannot locate this switch for the life of him, so please explain carefully and if not can you direct us on how to get a diagram of where it can be found? It would be extremely appreciated as I have 5 kids, am a single working parent, and am economically challenged(to put it nicely). Thanks again for your help in advance!
P.s. My ex also checked all the fuses and they are all good.
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The coolant temperature sensor, which will operate the cooling fan is located under the throttle body and screws into the intake manifold. It will have an electrical connector attached to it. These are less than $20.00 at your local auto parts store.

You may also want to check the fan relay before changing the temp sensor. If I'm not mistaken the relay is located under a plastic cover against the firewall.
Thanks so much for responding and so quickly too! ;) I will relay this to my ex and see what happens! I'll post results..Wish me luck!
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