I just replaced heater core on my 99 f150 and now no controls are working. I think it's a vacuum problem but not sure where to look. Dash is not completely back together but enough to check it out. I hope i don't have to drop dash again. Thanks

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    Welcome to the site! I'm sorry to say but I do not fully understand what your question is. Do you mind making an edit to clarify? Commented Feb 28, 2017 at 15:50
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    When you say controls, which ones do you mean? The amount of heat? The selector for directing the heat to defrost, floor, panel, etc?
    – CharlieRB
    Commented Feb 28, 2017 at 16:19

1 Answer 1


I would first check you are getting vacuum and then make sure the pipes are in the correct places.

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