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Sounds like you might have a bad MONO valve.
IF that's true- you would get full-heat regardless of the temp wheel setting. Go to Manual and review the test proceedure- it's easy.
Michael
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Michael McGuire
83 300d
01 vw A4 TDI
66 Chevy Corsa
68 GMC V6 w/oD
86 300E
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