1989 Gmc Yukon On Heater Core Which Inlet Outlet Tube Vaccum Line Valve

1989 GMC YUKON
180,000 MILES
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ANONYMOUS
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need to know , on the heater core, which is the inlet and outlet tube, and where the vaccum line for the valve to the core goes. thank you
Dec 12, 2012 at 7:20 PM
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HMAC300
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there is no listing for a 1989 yukon is this the correct year?
Dec 12, 2012 at 8:20 PM
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