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Heater and A/C Inop after changing out heater core

JMac's

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Joined
Jan 15, 2012
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Location
Kennesaw, GA
Need some help!!

I just got done replacing my heater core in my 1990 K5. Now the heater or A/C will not work. Can someone give me some advise as where to start?

Thank you,
JJ
 
i did check the fuses. Everything was good under the drivers side dash panel. I just got done checking the vacuum lines to make sure that they were connected. As for the blend doors, is there a way they should be when the heater or A/C is on??
 
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I just checked that switch. I have power to it. When I turn the switch from off to ac/vent/of floor, you can here a very soft noise and then it goes away. As for when I turn it from low to high. Nothing happens there also.
 
I am thinking the same thing. I just tied to turn on the radio and it came on but no sound is coming out. I did reach back there and I heard sound for 1 second. It must be a loose ground some where......
 
Thank you everyone for your help in this matter. I was able to get the A/C and heater working today.
 
The vacuum lines were on installed correctly. After tracking down the blower not working. The purple wire that goes from the relay to the blower motor was pulled loose.
 

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