Question about 1998 Pontiac Bonneville
I can access the thermostat but am not sure what tool is required to remove the bolts; I was told 1/2" crescent wrench would be sufficient but it doesn't fit and I don't have an extension on my ratchet set. I also would like to know where the water pump is located so I can replace that as well and if I will need a jack or etc.
Buy the extension as an individual item at Sears or any parts store. Another handy piece for your ratchet is a universal joint for use when the bolt is a little offset from a straight extension reaching the bolt.
The water pump will be on the front of the engine and run by the timing belt. Pretty involved procedure, check a repair manual for how it's done before you decide if you can do it and have enough tools. Most times, you have to remove the front motor mount and place a small jack under the oil pan (supported by a block of wood to prevent damaging the oil pan) to keep the engine from lowering. The crankshaft pulley and its tight bolt will also have to be removed. Mechanics use an impact gun to loosen the bolt, but can also be done with a socket over the bolt and a 1/2 inch drive breaker bar.
Check the repair manual and if you want to do it, buy the manual, it will be of invaluable help.
Posted on Dec 09, 2012
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Posted on Jan 02, 2017
No, just basic mechanics hand tools. This vehicle is 11 years old. I recommend you perform a complete cooling system service at the same time you replace the water pump. Drain, flush, replace the thermostat, replace the water pump, pour in a 50/50 mix of the correct antifreeze and distilled water. (Do not use tap water). Bleed all air from the system. Also inspect the radiator hoses and heater hoses. Replace as necessary.
Posted on Jul 04, 2010
SOURCE: replace thermostat
Follow your "top"radiator to where connects with the engine. The themostat housing is right there. Two screws usually hold it down. They may be metric, either 10mm. or 12mm. or they are American 1/2 inch. Remove them and make sure that you don't lose the large o-ring that seals the housing.I dont think it has a gasket, most are o-rings nowadays which makes thing much simpler. Remove the old thermostat with a long thin screwdriver. And place the new one (very important) with the "A" shape facing upward. Then replace the housing making sure to screw the screws back in at an even count(go a few on one the a few on the other) till tightened. P.S. there's usually no need to remove the hose from the housing. It will swing up and away.If the thermostat stays in the hose pry it out the same way as previously discribed and put back into the engine block again with the "A" shape facing upward. Hope you do well, Thanks Dana
Posted on Aug 14, 2009
no you have to go thru the holes in the front of the power steering pulley. Usually a ratchet with a deep 13mm socket will do to remove the 2 bolts located at 12 and 6 o'clock then you will be able to move it out of the way
Posted on Jan 11, 2010
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