Replacing the thermostat on a 02 buick rondeveux

The trouble code should tell you which 02 sensor? The 02 sensors are in the exhaust, sensor 1/sensor2, whatever, bank 1/bank2, whatever, before the cat, after the cat. You have several 02 sensors in the exhaust, don't know which one?
You should be able to remove/install with proper size wrench or deep socket. They do make an 02 sensor socket that has that slot in it, not sure if you need that, though.

check your fuel pump pressure sometimes after market parts are faulty

Does the engine make a bad noise, like it is not getting oil? If not, I would try replacing the oil pressure switch. I have had to do this twice in the past three years that we have owned my wife's 02 Buick.

Trace the upper radiator hose to the mounting area on the intake manifold. Loosen the hose clamp on the manifold end of the hose and remove the hose. Pull the thermostat out of the intake manifold.

For more help and troubleshooting go through the help links below:---

Click the link below:-----

THERMOSTAT REMOVAL PROCEDURE/LOCATION DETAILS

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Where is Thermostat Located on Saturn

http://technoanswers.blogspot.com/2012/11/where-is-thermostat-located-on-saturn.html

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2004 Dodge Intrepid: How to replace Thermostat?

http://schematicsdiagram.blogspot.in/2012/06/2004-dodge-intrepid-how-to-replace.html

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How to Replace Thermostat on Audi A4?

http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-thermostat-on-audi-a4.html

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How to replace Thermostat on Acura Car models?

http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-thermostat-on-acura-car.html

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Where is thermostat located on 2006 dodge magnum 3.5L?//

http://repairhelpcenter.blogspot.com/2011/10/where-is-thermostat-located-on-2006.html

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Thermostat on AUDI 1.9 TDI?

http://repairhelpcenter.blogspot.com/2011/10/thermostat-on-audi-19-tdi.html

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How to replace Radiator on Audi and VW car models?

http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-radiator-on-audi-and-vw.html

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How to Replace a Thermostat.

http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-thermostat.html

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How to locate Thermostat on Any car model?

http://schematicsdiagram.blogspot.com/2011/12/how-to-locate-thermostat-on-any-car.html

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Where is thermostat on Audi A6?

http://technoanswers.blogspot.com/2011/12/where-is-thermostat-on-audi-a6.html

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How to replace thermostat on 1992 Buick century?

http://technoanswers.blogspot.com/2011/12/how-to-replace-thermostat-on-1992-buick.html

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Replacing thermostat on 1999 Mercury Cougar?

http://technoanswers.blogspot.com/2011/12/replacing-thermostat-on-1999-mercury.html

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Thermostat Replacement on Toyota Corolla?

http://technoanswers.blogspot.com/2011/12/thermostat-replacement-on-toyota.html

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Where is thermostat located on 2005 Dodge neon?

http://schematicsdiagram.blogspot.in/2012/02/where-is-thermostat-located-on-2005.html
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These will help.
Thanks.

I just replaced a set of cooling fan motors for this problem, and the connectors on the motors were even melted, had to replace connector pigtails as well, th fans also cools the a/c condenser so if the fans quit then your a/c will not be very cool unless your driving and the air flow will aid like a fan would..

For heater core replacing procedure. I suggest you to go through this related help links.Its all complete step by step procedure: ----How to replace heater core for All car models?

Click the link below: ---

http://technoanswers.blogspot.com/2011/11/how-to-replace-heater-core-for-all-car.html

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How to Flush Heater Core?

http://schematicsdiagram.blogspot.com/2011/12/how-to-flush-heater-core.html

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How to Remove Heater Core ?

http://howtobyme.blogspot.com/2011/12/how-to-remove-heater-core-on-2008-honda.html
Heater Core Replacement?

http://howtobyme.blogspot.com/2011/12/honda-heater-core-replacement.html

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To replace heater core?http://technoanswers.blogspot.in/2012/02/how-to-replace-heater-core-on.html------

How to replace heater core?http://technoanswers.blogspot.in/2012/02/how-to-replace-heater-core-on_10.html
How to replace heater core on Buick Regal?

http://howtobyme.blogspot.in/2012/02/how-to-replace-heater-core-on-buick.html
----------This will help.Thanks.

Regarding this types of problem,i suggest you to go through this help links.Click the link below to go through the procedure and troubleshoot the problem :----

HOW TO REPLACE AN UPPER RADIATOR HOSE

http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-upper-radiator-hose.html

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HOW TO REPLACE A LOWER RADIATOR HOSEhttp://schematicsdiagram.blogspot.com/2011/07/how-to-replace-lower-radiator-hose.html
----------How to Flush Heater Core?http://schematicsdiagram.blogspot.com/2011/12/how-to-flush-heater-core.html
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For heater core replacing procedure. I suggest you to go through this related help links.Its all complete step by step procedure: ----How to replace heater core for All car models?

Click the link below: ---

http://technoanswers.blogspot.com/2011/11/how-to-replace-heater-core-for-all-car.html

--------------
How to Flush Heater Core?

http://schematicsdiagram.blogspot.com/2011/12/how-to-flush-heater-core.html

---------------
How to Remove Heater Core ?

http://howtobyme.blogspot.com/2011/12/how-to-remove-heater-core-on-2008-honda.html
Heater Core Replacement?

http://howtobyme.blogspot.com/2011/12/honda-heater-core-replacement.html

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To replace heater core?http://technoanswers.blogspot.in/2012/02/how-to-replace-heater-core-on.html------

How to replace heater core?http://technoanswers.blogspot.in/2012/02/how-to-replace-heater-core-on_10.html
How to replace heater core on Buick Regal?

http://howtobyme.blogspot.in/2012/02/how-to-replace-heater-core-on-buick.html
----------This will help.Thanks.

NO HAVE RADIATOR FLUSH DONE PUT 50/50 ANTI FREEZE IN IT ALSO DEPENDS ON THE WEATHER OUT SIDE IF ITS COLD OUT IT TAKES LONGER FOR YOUR CAR TO HEAT UP

Replace thermostat.

most likely a bulb. you should be able to get to it.