heat to only one side

[jerryt]

On my dash and floor vents the right side has good heat. The left side is only slightly warm. what has to be done and how difficult is it to do. Thanks for any help.

 

[bulrid8]

Try flushing your heater core, both directions. The core lays flat in these trucks, so if the top gets clogged, you lose heat to one side. Mine did same thing. Flushed it really good and it has been fine for two years since then.

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[Karlsweg]

Blend or mode door problem!