1996 - 2004 GMC Sonoma 4.3L ONLY. 1996 - 2004 Chevrolet S10 4.3L ONLY. 1996 - 2005 GMC Jimmy 4.3L. 1996 - 2005 Chevrolet Blazer 4.3L. Compatible With: 2002 Chevrolet Blazer 4.2L. The radiator cap that has not passed the test can’t release the pressure when it reaches the pressure value.
