Hi everyone. '89 Chevy van 8cly, 5.7.
Every symptom leans toward bad blower relay,
thought I'd check out some other possibilities.
First, in the bottom picture, only the far left pin has power (12v test light). Heat, ac, defrost click on it sounds like, though.

Top picture, the connectors coming out from behind the switch leading to relay.
No pins light up with my test light for power coming out. I can hear the defrost, heat, ac click, just no blower. Faulty blower switch maybe?
Thanks in advance.

 

Welcome from Florida. Did you check the blower motor resistor?

 

No. Every thing I've read says the resistor regulates the low, medium, high, and a symptom of faulty resistor will usually work on one speed. There is nothing at all when I move the switch.
However, I'm looking for an answer to the power going out from the switch.
If that's bad then there is no power going to the resistor or relay regardless.

 

Pulled out resistor. Has power in the resistor coils

 

Well, checked the leads attached to the fan. Getting power to the fan motor. Must be the motor itself.

 

Put 12v to the blower, see if it runs

 

Pulled the motor out.
It turns on with power.
​​​​​​However, I can wiggle the fan blade like there is a bearing loose. I can move it around, up/down/back/forth. Put it back and sounds like it's rubbing something.

 

replace it.
Often this burns out the resistor module too.

 

Ordered new one. Be here tomorrow.
​​​​​That motor shaft and the motor moved all over the place, like it was loose in the housing.
Should be good to go tomorrow.
Thanks for all you help!