97 Blazer oil cooler bypass
#3
If you're going this route, you might want to replace the "pressure regulating valve" (GM calls it oil pump bypass valve). The valve is in plain sight when you remove the adapter. If/when the spring gets weak or breaks, oil pressure takes a dive. Cheap part, under $15 at the dealer. Here is a "typical" illustration of how the bypass system works:
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LesMyer
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