Rick's Free Auto Repair Advice

Posts Tagged: Chevrolet

Engine Overheats – GM vehicles

Engine Overheats No radiator fans on GM vehicles, Chevrolet, Impala, Pontiac, Buick, Cadillac GM uses a pretty nifty technique to control the radiator fans on late model vehicles. The system consists of two fans and three relays. When the powertrain control module (PCM) detects the need for cooling from the engine coolant temperature sensor (ECT) at 223 degrees or refrigerant pressure above 190-psi., it provides a ground signal to the low speed fan relay. Power flows to one fan, and the ground for that fan flows to the second fan. … Read More

no start no crank no click – GM

How to diagnose a no start no click on GM vehicle. If you have a late model GM vehicle and turn the key only to hear nothing, you’ll most likely think you have a dead battery—and you may. But a no start, no crank, no click condition can be far more involved than that. In the old days, power flowed through the ignition switch and down to the starter solenoid. Not anymore. The ignition switch now talks to the body control module (BCM) and it’s the BCM that initiates one of … Read More

Car key won’t come out ignition switch – GM vehicles

Why won’t my Car key won’t come out ignition switch – GM vehicles Believe it or not, when your Car key won’t come out ignition switch it’s because of a rash of bad ignition switches in GM vehicles. When the switch fails in the open position, it doesn’t provide battery power to the Brake Transmission Shift Interlock (BTSI) fuse. The BTSI system consists of the brake pedal switch and a solenoid on the shifting mechanism. The BTSI prevents you from shifting into and out of park unless your foot is … Read More

Oil leak Cobalt Mailbu G5

I have an Oil leak Cobalt Mailbu G5 GM reports that an oil leak that appears to be coming from behind the starter motor is actually coming from a leaking oil pressure switch. The leak appears on 2.2L 4-cylinder engines made prior to 2/19/07. GM has issued a new part that holds up better. Replace the switch and clean up the old oil. © 2012 Rick Muscoplat

GM PassKey and PassLock overview

Diagnose problems with anti-theft systems in GM vehicles Read More

C0040 ABS light on GM Saab

Fix code C0040 ABS light on GM Saab If you have a Coo4o or an ABS light on, read this TSB. GM has issued a technical service bulletin for Buick Rainier (05-07), Chevrolet TrailBlazer (05-08), GMC Envoy (05-08), and Saab 9-7X. The TSB #07-05-25-006 relates to a problem with the ABS system and results in a scan code C0040. GM advises you to inspect the right front wheel speed sensor for damage caused by rubbing against the A/C pulley. If you find damage, wire in a splice and then reroute … Read More


Fix Trouble code P0446 on GM vehicles GM has issued a TSB (#04-06-0055) for code P0446 on 2000-03 Cadillac, Chevrolet and GMC full size utility trucks. The charcoal canister stores gasoline vapors from the tank. When certain driving conditions are met, the computer supplies power to the purge and vent solenoids. The purge solenoid opens the vacuum line between the canister and the intake manifold and engine vacuum sucks the vapors out of the charcoal. The vent solenoid opens a fresh air line into the canister. If these vehicles are … Read More

Clunk noise in steering

Fix clunk noise in steering on GM vehicles If you have a Clunk noise in steering in a 1997-2005 GM it’s caused by a “stick/slip” condition in the intermediate steering shaft. This is the portion of the shaft that goes from the steering column down to the rack. Because it has a flexible joint in it, the shaft is made to expand and contract. You guessed it, the grease they used causes it to bind. The new grease is part of a kit #26098237. You remove the intermediate shaft and inject … Read More

Droning noise from car on Cavalier and Sunfire

Fix droning noise from car on Cavalier and Sunfire Cavalier or Pontiac sunfire Got one of these with the 2.2L (Vin4) engine?  The droning noise happens most at high outside temps with the engine idling and the A/C on.  The problem is the accessory drive belt developing a resonance in the span between the alternator and A/C compressor.  The fix is to install a newer design belt GM #12575450.  The new belt is made out of a newer rubber compound that eliminates the noise. © 2012 Rick Muscoplat Save

Custom Wordpress Website created by Wizzy Wig Web Design, Minneapolis MN