1. Original cooler lines hooked up 65psi cold, 35-40psi warm.
2. Made up a small loop with a hydraulic line. Same psi, 65 cold, 35-40 warm.
3. Plugged the ports, again the same, 65 - 35.
There were absolutely no pressure spikes then a drop, as if I dead-headed the pump into bypass.
What threw me off a little in the beginning, I knew the truck had a new motor, but just assumed it was an "89 like the truck, but it is a 91-95, so the oil cooler routing and parts in GMDirect didn"t match.
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