I have a 68 coupe with a 302. I have vacuum lines on my car running from the carb to the distributor, carb to the PCV on valve cover, and from back of engine block to transmission modulator valve (don't have power brakes). However, I don't have any type of vacuum hose running to my heater. Is this only for cars with A/C? If I'm supposed to have one could you please tell me where it's supposed to be. Thanks.
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