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2007 Buick Lucerne Questions & Answers
2007 Buick lucerne code p420 , .
You need to find a mechanic that is smart enough to use a scan tool that is able to view the live data stream and find the source of the issue. The P0420 code can be frustrating as it is usually something insignificant that sets it. Could be a vacuum leak, and exhaust leak, a bad wire to one of the O2 sensors. It takes time with a scan tool to nail down the cause.
2007 buick Lucerne power brake hose locations
Can you give us more info about the problem? If you have disc brakes on all 4 wheels, each wheel has a brake caliper, the caliper usually has a hose attached to it, if that is what your talking about?
With abs, you need to follow proper procedure before taking anything loose or replacing.
How do you get the air out of a coolant system in a 2007 Buick Lucerne ?
In 2007 the Buick Lucerne was equipped with 2 engine options. 3.8 Liter OHV V6 and the Northstar 4.6 Liter V8.
Was the cooling system recently opened? What was serviced?
The 3.8 has a 7mm bleeder screw on the top of the thermostat housing. A funnel in the radiator is helpful to bleed the air. You will notice the upper radiator hose curves to a higher elevation than the bleeder screw. Manipulation of the hose by hand may be needed to get the air out. I recommend and use a cooling system funnel to help. It minimizes mess as well. (
https://smile.amazon.com/Lisle-24680-Spill-Free-Funnel/dp/B00A6AS6LY/ref=sr_1_1?ie=UTF8&qid=1488855489&sr=8-1&keywords=lisle+cooling+system+funnel ) There are other brands available as well.
I do not recall if the Northstar V8 has a bleeder on all models, but some do have a similar bleeder screw. Be sure the system is filled initially and manipulate the hoses up and down as well as squeeze them to get air moving. The Northstar water pump is on the back side of the engine driven by the camshaft. The upper hose runs along the front of the engine bay and connects to the radiator at the top on the passenger side of the engine bay.
For both vehicles, fill as much as possible cold. Start and idle. As the temperature increases, I recommend occasionally revving the engine to between 1500 and 2000 RPM to fill heater core and move coolant with a little more force.
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