I run 2 Spal fans on a performance engine in my E9. One is a puller attached to the radiator and the other a pusher attached to the ac. The pusher is wired to come on with high head pressure on the ac or when engine temps get to a set point. The puller is wired through a temp sensor on the engine.
Self etching primer seam sealer then paint. Remember that the seam sealer will be gone too as a result of dipping. Sometimes in the hardest to get to areas.
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