Chrysler Repair: plymouth blower motor resistor block, windshield washer fluid, blower motor resistor

Question
Hello Roland.  Before asking, I read many of your replies to questions about blower motors.  I have a similar problem with my 1991 Plymouth Acclaim v6.  The blower would run only on hi then it would be slow to come on.  I might have to turn the switch on and off several times to get it to come on.  Sometimes it would cut out if I hit a bump just right.  I pulled the motor and jumped it from the battery.  I fires right up and runs well when I jump it from the battery.  Next, I replaced the resistor block.  The resistor block is in tight quarters behind the windshield washer fluid.  I can’t be certain one of the resistors didn’t slip out of place during installation.

Now, when I turn on the fan, the motor will come to life for one revolution or maybe two then it will simply stop.  If I turn the power switch off then back on the motor will come to life again for one or two revolutions then stop.  I purchased a new motor and it does the same thing.

Have you any idea what’s going on there?

I plan to pull the resistor block again this weekend but in the meantime, I don’t have heat in the car and since I deliver newspapers early mornings, heat is important to me.

Thanks Roland.  Your answers are thorough and well expressed.

-Don


Answer
Thanks, Don, for your kind remarks. Aside from a flaky situation with the new resistor block the other possiilities are a blower switch that is flaky or a fuse that is cracked and alternatively opening when conduction and the closing as it cools due to subtle crack in the fuse wire. Fuse #9 under the dash on the driver side would be the one to inspect/measure with a voltmeter to see if it is flaky as I described. The same sort of inspection could be made of the blower switch. The resistors in the 'block' should be separated gently before you install it so they don't touch oneanother.
Roland