Test Drive and Verify Operation
9:37
11:29
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At 9:37 in
LBZ Duramax Thermostat Replacement (Quickest Way)
What happens here
Start the truck. Allow the engine to run while observing the coolant level in the reservoir. The presenter initially lets it run with the coolant cap off until coolant overflows, then replaces the cap. Take the truck for a test drive, closely monitoring the temperature gauge. The presenter notes that after driving, his truck's temperature gauge now consistently reads around 200°F, which is a significant improvement from its previous 150-160°F range, indicating the new thermostats are functioning correctly. He anticipates this will lead to improved fuel mileage.
Goal: Confirm proper engine temperature and cooling system function
Tools and materials
- 2007 GMC Duramax Truck GMC — The vehicle being tested
- Coolant Cap — Sealing the coolant reservoir
- Temperature Gauge GMC — Monitoring engine operating temperature