2007 Hummer H3

Introduction

The 2007 Hummer H3 is a mid-size SUV known for its rugged capabilities and off-road performance. It comes with a choice of two engine options: a 3.5L inline-5 and a 5.3L V8. Both engines are paired with a 4-speed automatic transmission. The H3 received mixed reviews at launch, with praises for its off-road prowess and criticisms for its poor fuel economy and interior quality.

Engine

3.5L Inline-5

• Oil leaks from rear main seal
  • Description/Symptoms: Oil leaking from the rear of the engine, visible as drops or puddles
  • Solution: Replace rear main seal
  • Estimated Cost to Fix: $300 - $500+
• Timing chain tensioner failure
  • Description/Symptoms: Rattle or whining noise from engine, engine misfires or hesitates
  • Solution: Replace timing chain tensioner
  • Estimated Cost to Fix: $500 - $1000+

5.3L V8

• Intake manifold gasket failure
  • Description/Symptoms: Coolant or oil leaks from intake manifold, engine overheating
  • Solution: Replace intake manifold gasket
  • Estimated Cost to Fix: $200 - $400+
• Fuel injector failure
  • Description/Symptoms: Engine misfires or hesitates, poor performance
  • Solution: Replace faulty fuel injector(s)
  • Estimated Cost to Fix: $100 - $200+ per injector

Transmission

4-speed Automatic

• Transmission slipping
  • Description/Symptoms: Vehicle hesitates or lurches when shifting, difficulty accelerating
  • Solution: Rebuild or replace transmission
  • Estimated Cost to Fix: $1500 - $3000+
• Torque converter failure
  • Description/Symptoms: Transmission shuddering, vehicle stalling or not moving
  • Solution: Replace torque converter
  • Estimated Cost to Fix: $500 - $1000+

Suspension

Front suspension

• Lower control arm failure
  • Description/Symptoms: Excessive vibration or clunking noise during turns or when hitting bumps
  • Solution: Replace lower control arm
  • Estimated Cost to Fix: $300 - $500+ per arm
• Stabilizer bar links worn
  • Description/Symptoms: Loose steering, clunking noise when turning or driving over rough roads
  • Solution: Replace stabilizer bar links
  • Estimated Cost to Fix: $100 - $200+

Rear suspension

• Leaf spring breakage
  • Description/Symptoms: Sagging or uneven rear end of vehicle, harsh ride
  • Solution: Replace leaf springs
  • Estimated Cost to Fix: $500 - $1000+ per leaf spring

Electrical

• Alternator failure
  • Description/Symptoms: Dimming headlights, battery warning light on, loss of electrical power
  • Solution: Replace alternator
  • Estimated Cost to Fix: $300 - $500+
• Starter failure
  • Description/Symptoms: Vehicle won’t start or cranks slowly
  • Solution: Replace starter
  • Estimated Cost to Fix: $200 - $400+

Exterior

• Tailgate latch failure
  • Description/Symptoms: Tailgate won’t latch properly, rattles or opens while driving
  • Solution: Replace tailgate latch
  • Estimated Cost to Fix: $100 - $200+
• Sunroof leaks
  • Description/Symptoms: Water entering the cabin from sunroof area
  • Solution: Replace or reseal sunroof
  • Estimated Cost to Fix: $500 - $1000+

Interior

• Heater core failure
  • Description/Symptoms: No heat coming from vents, coolant leaks
  • Solution: Replace heater core
  • Estimated Cost to Fix: $300 - $500+
• Air conditioning compressor failure
  • Description/Symptoms: No cold air coming from vents
  • Solution: Replace air conditioning compressor
  • Estimated Cost to Fix: $500 - $1000+

Summary

The 2007 Hummer H3 has some common issues that can be costly to repair, such as engine oil leaks, transmission slipping, and suspension component failures. Electrical problems, exterior issues, and interior problems are also reported. While the H3 is a capable off-road vehicle, its reliability issues can overshadow its strengths.