Help with weird heater blower issue

[RayN]

I searched for a while today and couldn't find anything regarding this particular problem.

A few weeks ago my blower started intermittently stopping. Over the last couple of weeks it has dropped into a pattern where the blower will run for 15 - 30 seconds when it's first turned on and then it will stop. Occasionally after this it will attempt to restart but only for a few seconds. After a little while it even goes completely dead. Here are the steps I've taken to troubleshoot this:

--I have an older blower that still worked and it displays the exact same behavior

--The behavior exists on every speed setting

--I disconnected the wiring to the speed resistor and, even though I lost all the slower settings, the problem still existed at the high setting

--I connected a voltmeter to the connecting cable without the blower and registered a solid 12.5 volts. When I connect the blower and the voltmeter, the voltage drops to 9.5 volts for the 15 - 30 seconds, then drops around 8 and then lower. Once it goes below 8 it drops to 0. Strangely, if I manually spin the fan I can see the voltage rise to 1 or 2 and then it drops to 0 again.

Any ideas would be greatly appreciated!!!

 

[travis127]

I have a similar issue. You get yours figured out?

 

[Mr Fusion]

It could be a bad fuse or circuit breaker.

 

[alpinemechanic]

You need to find if it has 12v and an earth when the fault is happening, is it does, you need to replace the blower motor

 

[RayN]

I did resolve this, the little circuit breaker under the steering wheel was faulty.

 

[frogeye]

Can you help me find this circuit breaker?
I have the same issue with my 89'.
Thanks,