Heater Not Blowing Hot Air - The 1947 - Present Chevrolet & GMC Truck Message Board Network

MashTheGas 72 · 11-28-2013, 03:56 PM

I have a 72 GMC pickup that I just changed out my heater core with a new one since the old one was leaking. I installed the new one and now my heater want blow anything but cold air. I noticed there are a couple of electrical connections and something that looks like a relay on the right side of the heater core box. Just wondering if that can go bad. If you shake it sounds like something is loose inside. The truck did come with air just not hooked up right now. I would really appreciate any advice. Thanks in advance.

11-28-2013, 03:56 PM	#1
MashTheGas 72 Registered User Join Date: Nov 2013 Location: Folkston Ga Posts: 178	Heater Not Blowing Hot Air I have a 72 GMC pickup that I just changed out my heater core with a new one since the old one was leaking. I installed the new one and now my heater want blow anything but cold air. I noticed there are a couple of electrical connections and something that looks like a relay on the right side of the heater core box. Just wondering if that can go bad. If you shake it sounds like something is loose inside. The truck did come with air just not hooked up right now. I would really appreciate any advice. Thanks in advance. __________________ 72 GMC 1/2 Ton

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