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My E39 5HP19 transmission fail again!
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<blockquote data-quote="rpmnut" data-source="post: 478111" data-attributes="member: 20757"><p>Hey bro,</p><p></p><p>You might want to check the ZF5HP's thermal bypass relief valve. This valve is like the thermostat in car's engine. It keeps the gearbox fluid at the optimum temperature by shutting off the fluid flow to the radiator core when the transmission is cold, and opening the flow when the fluid gets hot.</p><p></p><p>My mom's 325i (E46) had a gearbox that constantly overheated, especially going up hills. AB diagnosed it as a stuck bypass relief valve. They swapped out the valve and the gearbox never overheated since then.</p></blockquote><p></p>
[QUOTE="rpmnut, post: 478111, member: 20757"] Hey bro, You might want to check the ZF5HP's thermal bypass relief valve. This valve is like the thermostat in car's engine. It keeps the gearbox fluid at the optimum temperature by shutting off the fluid flow to the radiator core when the transmission is cold, and opening the flow when the fluid gets hot. My mom's 325i (E46) had a gearbox that constantly overheated, especially going up hills. AB diagnosed it as a stuck bypass relief valve. They swapped out the valve and the gearbox never overheated since then. [/QUOTE]
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My E39 5HP19 transmission fail again!
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