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Re: which is the heater intake?
There are 2 hoses that go thru the firewall on the passenger side. One carries hot water from the engine water jacket, to heat the core, and the other brings the water back to the radiator. Follow the hoses to see which one goes to the radiator and the other will be the heater intake. Another way to tell, with the heat on, the hotter of the 2 will be the intake.
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Replace the complete heater control vacuum line over the motor with rubber vacuum tubing. The heater vacuum line connects on the drivers side of the engine halfway back on the intake manifold.Run the new line to the heater vac connection at the passenger side at the right front in the engine compartment. I change 2 a week....this should be where your problem is.