JetTool

Have a 1990 vert...Electronic Climate Control...

Simply put, the blower motor won't turn on...

After checking both fuses...I think the problem is that I don't have any voltage to red wire in the C1 connector at the blower control module...

As I understand it, this wire should have 12 volts...

In my 1990, the C1 connector has a red only, the other slot is empty...
The C2 connector has a black, purple, and a green/yellow, the 4th slot is empty...

Any ideas on what to check next?

Is there a relay somewhere?

Thanks in advance...

Hooked on Vettes

Red wire is a 16 awg fusible link. 12 volts hot all the time. If you look at the starter motor you will see a heavy gauge Black wire which is 12 volts from the positive terminal of the Battery to the starter motor.

This fusible link attaches to the same lug on the starter motor. If the starter motor works it indicates you have 12 volts from the battery and the Red wire fusible link must be blown if you have no 12 volts.

Probably the Blower Control Module is bad.

You can unplug the two pin connector going to the blower motor and apply 12 volts to the motor and verify the motor works.

You remove the Blower Control Module by unplugging C1 and C2 connectors and remove the small bolts on the outside perimeter of the mounting plate and pull it out of the evaporator housing.

The Black wire is Ground.

If you use a volt meter use the Black wire for the meter ground probe.
You should measure 12 volts DC to the Red wire.

The Purple wire is the voltage output from the Blower Control Module to power the Blower motor.

The Green/Yellow wire is the voltage from the HVAC Programmer.
With the ignition On.
The DC voltage on this wire will vary as you manually change the HVAC fan speed control buttons.

JetTool

Thanks Hooked...I thought it was near the starter but could not find it...

This location if for a 1990 C?

I'll look again...

I think I'll wait until I get power to the red wire at the blower motor module before I replace it...the car has 17K miles on it, can't imagine that it has failed...

Hooked on Vettes

Yes on a 90 there are three wires going to the starter motor.
Purple wire is the 12 volts when the ignition is in Start for the Starter solenoid.

Black wire goes to the Starter Motor terminal lug. 12 volts from the Battery.

Red or Orange colored wire goes to the Starter Motor terminal lug and is 12 volts for the Blower Control Module. (fusible link).

Make sure you disconnect the negative Battery terminal before removing any of those wires.
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JetTool

Thanks for the pic!...this is starting (no pun intended) to make sense...I removed the starter some time ago to get it checked, most likely did not tighten it enough...

Hooked on Vettes

Probably left it hanging/disconnected.