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I had a slight discomfort the other day going to work. I went to turn on the A/C and the fan would not work in any position or setting . I tried manual and auto setting and no avail. But when I went to go home it wasn't working when I started MIZR then I hit a speedbump on way out of the Prison and it came on and has been working normal since. I came home and checked all conectors and nothing lose or showing signs of looseness. Any ideas or has anyone else had this problem with the A/C system and can shed some light on a sloution or area to check? Its going to be hard to diagnois if its working and its to dang hot to have it fail now.
 

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You have almost certainly narrowed the fault to an intermittent open circuit. Some of the most difficult faults to find (depending on the hindsight specifics of where).

To troubleshoot any electrical system problem you'll need the circuit diagram. The Insight's ETM (Electrical troubleshooting manual) is the best. About the only diagnosis you could possible do without it is to determine whether the fan motor itself is at fault.

Using a 12v test light connect in parallel with the B+ feed to the motor. The next time it fails if the light is on then with the open palm of your hand smack the bottom of the blower motor. More than likely it will begin working.

If the light does _not_ come on verify your rigged connection before panicking. <g>

If not you'll then have to continue up the ladder with this approach, but beware! The test light "trick" should only be used in "high" power circuits. Using the test light further upstream, particularly on the control panel outputs, can fry the component. The transistors and the like on many circuit boards are simply not designed to provide the current required for a test light.

Even an older DVOM of less than 1 Megohm/v can damage some automotive circuits (usually a cheap analog meter).

HTH

John K. Bullock
aka. Insightful Trekker
 

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This is a very typical problem with blower fans. This is a brushed DC motor. What happens is that the motor stops on a bad spot of the commutator and will not restart without being jarred. This will reoccur randomly. Or---The brush had a bit of dirt between it and the commutator and once moving will probably never reoccur. The fix will be to replace the blower.
 
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