Ok, so I noticed the ac was vacuum actuated on the 5.0, well first off I was only getting heat and cold through the defrost, fixed the issue with the little hose being unhooked from the AC line on the tree. So what gives? Blend door, or what? I was going to look for a blend door before I found out these were vacuum operated, so what do I need to do? It won’t blow hot or cold on low or medium, only high. Someone have a vacuum hose Diag for the 94 5.0? My chiltons don’t have it.
94 GT AC & Heat only blow on HIGH
- Thread starter Lawman86
- Start date
The line is probably cracked and crumbled from the tree in the drivers fender over to the inlet on the passenger side of the firewall. It’s crumbled on pretty much every sn out there.
If you’ve already replaced the entire line then either the line is bad between the firewall and the cluster or you may have a bad switch in the cluster. This also happens. The one that adjust where the air blows is just a vacuum switch.
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If you’ve already replaced the entire line then either the line is bad between the firewall and the cluster or you may have a bad switch in the cluster. This also happens. The one that adjust where the air blows is just a vacuum switch.
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Would it be causing me not to have heat and air in low and medium or would that be a resister near the blower motor?
ttocs
Post Whore
the vac line will make it only blow from the defrost . I was thinking the resistor myself.
What vacuum line runs under the manifold on the 94 5.0? It’s the one that runs to that little canister shaped piece with wires going to it? I can’t figure out where under the intake it came from because I’ve got no diagram to show me let alone what that part goes to
ttocs
Post Whore
It goes across the back of the motor to the drivers side where the vac tree is. IF you look behind the intake you will probably see the other broken line.
The one that I broke goes to the evap canister from under the intake. The supply one from the tree goes somewhere else. This one was a factory original softy that had long been past its prime. I gotta find that resister so that way I can test it
I got it figured out. One of the lugs on the 4 wire harness was melted. Got another harness from the pull a part and also robbed the new looking Resistor as well. Got a very nice, arm rest lid not cracked, license plate bulb covers, two like new door pillar plastic pieces all for $4. Got the plug and resistor plugged in and we’re working on all settings. Now to get an alignment on this thing.
Is it switching to all of the different ports correctly now as well?
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Yes
