Thermostat replacement replacement instructions please?

Tiny
TEJO
  • MEMBER
  • 2000 BUICK CENTURY
  • 3.1L
  • 6 CYL
  • AUTOMATIC
  • 120,000 MILES
I m having problems replacing the thermostat on my 2000 Buick Century.
I can’t remove the upper bolt on the Thermostat Housing; I don’t know if it’s frozen in place or, I just can’t reach it well enough to get a good grip on it (or both). There are two horizontal pipes in the way, one’s black and the other’s silver. I tried liquid wrench’ on the bolt and gave it several good taps, but it won’t budge.
To access the bolt better, I tried to remove the Throttle Body. I removed the nut on the lower right side of the TB (in front of the small black plate that’s attached to the black pipe). However, I can’t seem to remove the stud bolt that comes from the Throttle Body and extends through the slot in the small black plate.
I’m wondering if I should try to remove the black and silver horizontal pipes that are blocking access to the upper bolt on the Thermostat Housing. If so, I’m not sure how; I can’t find any info on how to do it. By the way, the lower bolt on the TH also seems be frozen or, I can’t get enough leverage (or both). I would appreciate any advice that anyone can give me. THANKS!
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Wednesday, May 26th, 2021 AT 12:23 PM (Merged)
Tiny
JDL
  • EXPERT
Sorry for the late reply.

My info says to remove air pipe and exhaust cross-over pipe to get at thermostat housing. You would have to look at each end of pipe to see how to take loose.

Use a 6 point wrench or socket to remove bolt. You can use a cheater on rachet or wrench, just a long piece of pipe that will fit over tool, gives you more leverage. There are three things that can happen if you use a cheater, and two of them are bad.
1. The bolt comes loose.
2. You break the bolt, then you have to fish out the broken piece.
3. You strip out the threads, that's not hard to do, then you have to retap the hole and use different bolt.

I realize this is an old post, you probably no longer own this vehicle. In the future, hopefully, you don't have any vehicle issues, but, if you do, keep the site in mind. They are always working to make the site better and it's free.

Have a good day.
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Wednesday, May 26th, 2021 AT 12:23 PM (Merged)
Tiny
GTINDALL
  • MEMBER
  • 1992 BUICK CENTURY
3.3 v6 thermostat removal
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Wednesday, May 26th, 2021 AT 12:23 PM (Merged)
Tiny
RASMATAZ
  • EXPERT
Fig. 16 Thermostat & Housing Assembly


https://www.2carpros.com/forum/automotive_pictures/12900_t_11.jpg



Refer to Fig. 16 when performing the following procedure.

1.Disconnect battery negative cable.
2.If necessary, remove air cleaner assembly.
3.With engine cool, drain engine coolant below thermostat level. Never open cooling system with engine hot.
4.Disconnect radiator hose from thermostat housing.
5.Remove thermostat housing retaining bolts, then the housing, gasket and thermostat.
6.Reverse procedure to install noting the following:
a.Ensure thermostat gasket area is thoroughly clean.
b.Install thermostat with new gasket.
c.Apply a suitable sealer to thermostat housing retaining bolts. Install and torque bolts to 20 ft. lbs.
d.Refill and bleed cooling system as necessary.

https://www.2carpros.com/kpages/auto_repair_manuals_alldata.htm
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Wednesday, May 26th, 2021 AT 12:23 PM (Merged)

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