Heater not working? Need help

[FastOrange]

So i give up, i need a hand guys, i cant figure out this for the life of me

When i got my 1996, everything worked great, but then slowly i was loosing fan speeds and i figured it was time to do the resistor.

by the time i actually did the resistor i had high only. put a new one in, no change!

but a new fan speed switch in, no change...

last night i tested the fan, worked okay. put a jumper cable from the neg post battery right to a stud on the firewall and another from neg to alt case.

no difference.

got a used climate control panel out of a truck from the wreckers, tested in truck before putting it in, STILL no difference.

decided to get the harness for the resistor/relay. spliced that in.

still no difference.

and my high doesnt always work, it is intermittent, i literally have nothing or sometimes high?!

thoughts!!

EDIT: also ran a wire right from fan ground right to bat neg, and i have been through like 5 relays, no difference at all

 

[96Z71ECSB]

Replace the fan.

 

[FastOrange]

Replace the fan.

thats my next step, but we took it out lasted night and hooked it upto a battery, worked great everytime.

 

[RHamill]

check the body side connector (male) for the fan speed on the back of the HVAC controls, I had the same problem you had TWICE, the resistor was drawing to much current and melting the wire, I bet your connector is melted man.

 

[oohunter04oo]

on my cousins truck the connector to the ac control head was burned up. we had to replace the control head and a new connector. so maybe that happened to yours and you replaced the control head and didn't notice the burned wires?

 

[FastOrange]

just put the fan out of my 1994 in my 1996, fan is a OEM Delco, works great in Orange truck, same problems.

its not the plug on the back of the controls, i had 3 different controls in it last couple days...

 

[RHamill]

So you checked the fuse, relay, replaced resistor, tried know good working fan, connectors are fine..

There really isnt much more to check.. there has to be a bad connection somewhere if its intermittent.

 

[FastOrange]

So you checked the fuse, relay, replaced resistor, tried know good working fan, connectors are fine..

There really isnt much more to check.. there has to be a bad connection somewhere if its intermittent.

We have literally checked everything, my friend is a red seal mechanic and works at a wreckers, so last night me and him tried abunch of stuff while I was at his place (he lives in a house at the wreckers) so we tried different stuff to see what my problem is, then I was going to pay afterwards

But for the life of us we can't figure it out, checked all fuses an relays, everything seems okay.

 

[FastOrange]

Took controller out again, just to double check, all plug look fine, no melting, all of them look perfect?

I'm so lost dudes?!

 

[orangeastre]

Check the printed circuit board on the controller for lifting on the trace. I have had dozen's of these over the years that worked until you touched them. I junk a dozen trucks a year and 96-98 hvac controls are getting hard to find in working order.