* Transmission Problems: This is a frequent complaint across many Blazer generations. Issues range from slipping, harsh shifting, and complete transmission failure. Automatic transmissions seem particularly prone to problems.
* Engine Problems: Depending on the engine, common issues can include:
* Leaks: Oil leaks from the valve covers, rear main seal, and oil pan are relatively common.
* Overheating: Can stem from issues with the radiator, thermostat, water pump, or cooling fans.
* Engine knocking: Can indicate problems with bearings or connecting rods.
* Electrical Issues: Problems with ignition systems, sensors, and wiring harnesses can lead to starting difficulties or rough running.
* Rust and Body Corrosion: Especially prevalent in older models, especially those frequently exposed to snow and salt. This can affect the frame, body panels, and undercarriage.
* Suspension and Steering Issues: Worn ball joints, tie rod ends, and control arm bushings are common sources of suspension noise, poor handling, and uneven tire wear. Steering pumps can also fail.
* Electrical System Issues: Wiring harness issues, faulty sensors, and problems with the alternator or battery are common electrical complaints.
* 4x4 System Problems: In 4WD Blazers, problems with the transfer case, axles, and differentials are frequently encountered. This is especially true for off-road use.
* HVAC System Issues: Problems with the heater core, blower motor, and AC compressor can lead to inadequate heating or cooling.
It's important to note that the severity and frequency of these problems can vary significantly depending on maintenance history, driving conditions, and the specific model year. When considering a used Chevrolet Blazer, a thorough pre-purchase inspection by a qualified mechanic is highly recommended.
