11-12-2018, 05:49 PM
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Afourian MVP
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Join Date: May 2009
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Quote:
Originally Posted by ndutton
Joe, it sounds to me like your heat exchanger is/was insufficient to do the job. I speak from experience, the best thing I ever did for my FWC was to replace my eBay 2 pass Sendure HX with a new Seakamp 4 pass as big as available space would allow. The improvement was huge right out of the box, enough to allow the new MMI thermostat take control (bypass restriction valve still installed but fully open). Now with electric FWC I am steady at 150°~160° running hard.
Before, with the old HX, no stat and bypass valve fully closed (max cooling) hard running was at 190°+ approaching 200°.
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I think you are correct. The common A4 HX is just not big enough to do what I want. It is "two-blocked" in the summer.
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