Wire harnesses hanging from passenger dash

[axekick]

I know I'm going to have to start pulling the dash and cleaning stuff up and making things work but I thought I'd ask first, what are these wires hanging from the dash? I figure it might be obvious to you guys who have been there already.

I have to get the AC in this thing working before it gets vrey hot around here. Right now the blower doesn't even blow.

 

[1987 GMC Jimmy]

That looks like the ECM and ALDL harnesses and connectors. Is your engine completely removed from the TBI system? I'm sure it could be something else, but I don't know what else would be back there.

 

[axekick]

That looks like the ECM and ALDL harnesses and connectors. Is your engine completely removed from the TBI system? I'm sure it could be something else, but I don't know what else would be back there.

That makes sense! It is a carburated pontiac motor. I didn't think about it being a TBI motor before. Was an 87 a TBI?

 

[1987 GMC Jimmy]

Yep, 1987 was the first year for the trucks. If your truck was a TBI, and all that was disconnected, I doubt it would even start. What are you gonna do?

 

[axekick]

It's running fine. I just have to turn on a switch for the fuel pump and the carburetor does the rest. I just bought it and the motor was already swapped. I'm going to swap it again, though. However, I need to get the AC stuff figured out. Starting with the blower. Where do I start? Take off the switch panel and work my way to the blower?

 

[bucket]

It's running fine. I just have to turn on a switch for the fuel pump and the carburetor does the rest. I just bought it and the motor was already swapped. I'm going to swap it again, though. However, I need to get the AC stuff figured out. Starting with the blower. Where do I start? Take off the switch panel and work my way to the blower?

The switch might control the stock pump in the tank. If so, you will want to make sure a bypass style regulator is being used. If not, I don't think the stock pump will live very long being corked up like that.

First thing to check for is power at the blower and a good ground wire at the blower.

 

[1987 GMC Jimmy]

What's the blower doing when you switch the HVAC unit on? Is it at least clicking?

 

[axekick]

I don't hear it do anything. I'll get out the volt meter tonight if I have a chance. I do not know my way around this old truck yet but I have a feeling I'm about to learn if it ever to be what I want it to be.

 

[1987 GMC Jimmy]

Well, just take a look at this thread that 89Suburban posted on blower motor troubleshooting.

http://www.gmsquarebody.com/forum/showthread.php?t=11272&highlight=Blower+motor+troubleshooting

 

[axekick]

Thank you for the link! I bet that'll have the answer!