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Originally Posted by LandYaghtLover
Found it. Its under some electronics and a hood switch.
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I am curious. What does that switch do? I have been searching to find out but to no avail.
I know you replaced the monovalve but it still has the symptoms of a bad monovalve. My car did the same thing; some heat at low speeds and no heat at highway speed. The diaphram was damaged. I installed a MTC monovalve and it worked correctlly. It has been about 6 months now and it is still working fine. Maybe try another cheapie MTC monovoale, seems they might be a little hit&miss as far as working right.