Where is number one cylinder located on 2006 chevrolet cobalt

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Need to know what was done to need to bleed the brakes. Easiest way to bleed a brake system is the gravity bleed. Crack open all 4 bleeder screws a little, open your cap on the master cylinder, and wait. Make sure to keep plenty fluid in the master cylinder while doing this. After about 30 min or so you should have pure brake fluid coming out of all 4 bleeder screws. If you have one that does not have fluid coming out, tighten the others and open the one up more until fluid comes out. After all four wheels have fluid it is still a good idea to have a buddy help you bleed them once the old fashion way by pumping up the brakes, hold the pedal and crack open each beeder one at a time.

Just because the master is new does not mean it isn't faulty. If you are certain you have bleed all the air from the system, I suspect you got a bad master.

check clutch installment procedure could be the problem how it was installed.

Slave cylinder is what compresses the clutch, the black plastic piece your talking about should pass throughout the firewall and actuate the clutch master cylinder.

There is a TSB on this issues if your having ignition lock issues.
Service Information
2009 Chevrolet Cobalt | Cobalt, G5 (VIN A) Service Manual | View All Bulletins | Document ID: 2325129
#09-02-35-005: Ignition Key Difficult to Remove, Ignition Key Binds or Sticks in Cylinder (Replace Ignition Cylinder) - (Aug 10, 2009)

Subject: Ignition Key Difficult to Remove, Ignition Key Binds or Sticks in Cylinder (Replace Ignition Cylinder)

Models: 2008-2009 Cadillac CTS (Built Prior to VIN Breakpoint 90163371)

2005-2009 Chevrolet Cobalt (Built Prior to April 14, 2009)

2006-2009 Chevrolet HHR (Built Prior to April 14, 2009)

2007-2009 Chevrolet Equinox (Built Prior to July 2008)

2005-2006 Pontiac Pursuit (Canada Only)

2006-2009 Pontiac Solstice (Built Prior to April 14, 2009)

2007-2009 Pontiac G5 (Built Prior to April 14, 2009), Torrent (Built Prior to July 2008)

Attention: This bulletin only applies to vehicle equipped with automatic transmission.

there isnt one on the cobalt theres a drain plug behind the passenger tire and a red fill cap on the top of the tranny, retarded isnt it?

the battery of your cobalt is located in the trunk of the vehicle. first place i looked was the hood and to my surprise it wasn't so i looked in my owners Manuel and read that it was located in the trunk.

The Cobalt’s LS, LT and LTZ sedan share a 2.2-litre Ecotec inline four-cylinder. The SS uses the 2.4-litre, while the SS Supercharged coupe carries a 2.0-litre Ecotec with supercharger.

If the wheel is turned in either direction, pull the whell in that direction and try getting the key out. If that doesn't do it, try shifting the automatic transmission from Park back to drive, and then to park again to disengage the interlock.