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Old 12-17-2018, 10:29 AM
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Join Date: Oct 2017
Posts: 52
Monovalve Rebuild

Since the OEM monovalve cartridge is now $130+ I decided to try the MTC cartridge but didn't have any luck, They would work fine under 2500 rpms but no heat at freeway speeds. I decided to disassemble the MTC and use the diaphragm to rebuild my oem cartridge. So far it is working perfectly. Video is below on the rebuild process.

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Old 12-17-2018, 10:41 AM
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Join Date: Sep 2004
Posts: 8,937
Apparently, the spring in some aftermarket cartridges is too weak to keep the valve open in the face of higher coolant flow rates due to higher engine rpm.

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