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Old 08-03-2014, 08:33 AM
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MT-2500 MT-2500 is offline
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Re: 1996 s10 4x4 heater problem

Quote:
Originally Posted by MT-2500 View Post
There is usually a open port for venting.
Engine vacuum usually goes thew a vacuum tank under hood.
Plastic and rubber hoses.
Make sure no hoses off or broken.
Check for good engine vacuum at and to and to heater controls from tank.
No. 6 port black\gray is hose and vacuum to controls. Good old vacuum gauge helps test for good full engine vacuum.
Around 16 to18 in. is good.
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