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1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-14-2009, 10:50 AM   #11
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Originally Posted by bonnie90se View Post
I've tried to remove the thermostat housing twice this past week and it seems stuck. I removed the engine cover with the 3800 on it, removed a bolt and tried to remove the housing but it doesn't budge.
I'm I doing something wrong? Are there two bolts? Do I have to remove something else besides the one bolt?
2 bolts, 1 opposite the other. There are 5 pics in the thread this link will take you to, look at the 4th pic:

https://www.gmforum.com/t277853/
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Old 10-14-2009, 02:23 PM   #12
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Thanks for the help.
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Old 10-16-2009, 09:25 AM   #13
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Okay so I tried to gain access to the thermostat housing again late last night to no avail. I looked at the link as you mentioned but it doesn't show how to remove the other parts that are on top of the thermostat housing. As far as I can see, part of the intake has to come off as well? I am getting really frustrated because it seems like a simple job yet there are many more parts to remove in order to get at the thermostat housing.
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Old 10-16-2009, 09:34 AM   #14
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We will get someone with a 90'ish Bonneville to look at this, but you shouldn't have to remove anything to get the thermostat housing off.
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Old 10-16-2009, 02:19 PM   #15
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Thanks 2KG4U.
I don't even see the second bolt, there is a lot of intake parts on top of the thermostat housing.
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Old 10-16-2009, 02:31 PM   #16
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Sit tight for a minute. I just sent a PM to Danthurs, and if he is available he will chime in pretty soon with some advice.
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Old 10-16-2009, 02:34 PM   #17
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You don't need to remove any other parts to get the housing off. There are two bolts, one at about 2 oclock, the other at about 7 oclock. You will need a socket and extension to get them off. Possibly a swivel. Once those two are off, there'* nothing holding it on other then a stuck gasket, so you may need to pry it a little.
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Old 10-16-2009, 02:56 PM   #18
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I see the bolt at the 7 o'clock position but not the one at the 2 o'clock position. It must be under all those intake parts I was trying to remove last night. So what you guys are saying is that if I look directly over the intake parts at the 2 o'clock position, I should be able to see the second bolt?
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Old 10-16-2009, 03:03 PM   #19
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I will try it again tonight.
Thanks again, you've been a great help!
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Old 10-16-2009, 03:03 PM   #20
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Yes, it could be covered in grim if your engine is dirty.
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