I took my 2007 Silverado 2500HD Diesel to Zylstra because it was overheating coming back from Pismo over Cuesta Grade HWY 101. From the moment I called Zylstra Auto until the day I picked up my rig I felt confident that they knew exactly what the diagnosis was and how to repair it! It turned out that my truck was experiencing a common problem for this year and make, dust and debris gets trapped between the radiator and condenser and in my case my fan clutch was weak and not fully engaging. I dropped off my truck and it was ready within 48 hours. Well it was time to go back over the grade again but now fully loaded with a 32’ 5th wheel toy hauler loaded with a RZR and two quads. Wow what a relief! my truck temperature never moved north of the halfway point and got us back to Fresno with no problem! These folks are great! - George B (5 star review found on Facebook)