Bypass valve question - Ford Powerstroke Diesel Forum
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Old 04-03-2014, 08:22 PM
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Bypass valve question

I have a 99 7.3 with a 4r100. Been fighting an overheat issue with the transmission. I've boiled it down to the bypass valve but I cant seem to get a part number for it. The only one I could come up with is 2c3z7h322ba and this appears to be for a 02-05. Has the part been discontinued or will it work with a 99. I am not looking to delete this feature either. Thanks in advance!
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Old 04-03-2014, 10:35 PM
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a plugged vent line will overheat/puke trans fluid
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Old 04-03-2014, 11:26 PM
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does it overheat only when loaded or when empty too?

how does your fluid look/smell? old fluid will cause more heat which will cause a snowball effect on overheating.
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Old 04-04-2014, 05:09 PM
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I got the truck last November and put gauges in it. I immediately knew I had a problem. My other powerstoke has a ford hd tranny, stock cooler, and it never saw over 150 during the summer. This truck was hitting the 250 mark with sub zero temperatures. The fluid looked really good. With temperatures rising this spring I put in a 6.0 cooler, changed the fluid and the filter just to be sure.. The temps dropped by maybe 10 degrees on my daily 14 mile commute. If I drive any father it keeps on climbing. My gauge ends at 250. never thought I'd need more than that! This is all empty too. Its not too often I have to tow. I have not done a flow test. I think that's next to do but I'm thinking it's going to be the bypass valve.
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Old 04-04-2014, 05:10 PM
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It is not puking any fluid out either.
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