Hottest day of the year so far and my blower quits

hear said:
The first half of the thread (or maybe just posts #9 & #13) would make for a great how-to.
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I'm going to go into my post #13 and delete the link to the relays from Amazon, one of them was OK but the second one I took out of the box to use this week and it was bad, had a loose connection on the hot side of the coil and there is no way to get in there to try and fix it without destroying it, it's sandwiched in between 2 plates where pin #86 attaches. I found better ones at my local electronic supply.

I also added a second relay in the high speed wire that comes off the back of the speed switch after seeing one melt in a post last week.
 
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B1Toad said:
You can throw a control unit at it if you want, but you really should troubleshoot what you have first. If the blower works on high then we already know the blower relay is working and sending power to the blower motor. That power does not go thru the switch, it goes directly from the relay to the motor and the modes and fan speeds are controlled by the negative side of the circuit.

So if you look up the wiring diagram in the service manual for your 1999 over in the TJ Resources section you will see that the speed switch has 4 terminals, 3 of them send the negative thru the resistor block but the high speed terminal bypasses all of that and sends the negative directly to the blower motor.

So you either have a dash switch that is not sending that negative to the various resistor taps (which seems unlikely that all 3 positions would fail given the design), or the black/tan wire from the end of the resistor block to the blower is open, likely at splice 208.

Taking the dash apart is easy and also explained in the manual. A plastic trim tool/pry bar can help remove the console trim without damaging it once you remove the screws.

The diagram below is for my 2000 but I believe your 1999 is identical.

View attachment 539143
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Responded without fully reading original complaint and Forum won't delete my post here.
 
I am kicking myself for reading this post back on Tuesday.... My blower motor started acting funny this morning. Come to a stop, it stops spinning at any speed. Give it some gas to get moving again and the blower starts spinning. Hit a bump pretty hard? It will stop until I hit another bump.

Ill need to investigate further once I am all moved back home with my tools, but so far the connection at the blower motor is fine......

Bet its a burned up connector at the control unit.....
 
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