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Re: 1998 Grand Cherokee blower not working
Check blower fuse, relay and power at blower motor harness terminal. Check for proper grounding at dashboard and body as well. Yo good lucku can run a hot wire to the blower motor and touch it to the connector spade to check if blower itself is OK. There are other components in the system, but this is a good start! Don't forget...fuses blow because there is a problem elsewhere. If you replace one and it blows again, there is something else wrong!
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Nov 14, 2012 - Uploaded by Freedomautomotive1
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If it is a warning light shaped like a door key, it could be the warning light for the security system. Its telling you there is a problem with the chip in your key or the sensor in the lock cylinder. Your owner's manual should show all of the warning lights and what they mean.
Check where the wires go into the blower housing. There is usually what appears to be a small plate held by 1 or 2 screws that the wires plug into. This is the speed control resistor. If it's going bad, it will cause the problem you describe.
What you are saying is when you turn knob to hot you don't get any heat.? Let's start with the basics. Make sure your cooling system is filled up with coolant. Then with the engine warmedup and the temp gauge on the dash indicating between H and C. Find your heater hoses under the hood and feel them. Are they BOTH very warm or hot? os is only 1 warm and the other cool? If both are warm/hot, and still not getting heat from your vents. You have a problem with either the temp controller or the blends doors under the dash. usually the blend doors and it requires removal of the dashboard to get to it. If the heater hoses are wrm and cold then you may have a plugged heater core or water pump not circulating properly.
2 possibilities, a bad wire somewhere (a break in wire) that's causing this, or a defective gauge. How often does it go to 0 volts? If you put a load on system when it drops to 0 volts (lights on, a/c on, hit the horn) does everything seem normal? If it does, it must be a bad gauge.
This has happened to me on my 1998 Grand Cherokee for the past couple of years. It is intermittent, same problem with the a/c blowing only hot air. My mechanic said it would require taking the whole dash apart which would cost a couple hundred bucks. He said it was a baffle that was getting stuck. So now, when it happens I hit under the dash to the right of the console with the palm of my hand. It will loosen the baffle into place and then it works fine. Not only that, getting out my frustration gives me some satisfaction. :-)
The cooling system is fine along with the heater core. I finally took it to shop and the actuator that controls the regulator was inoperable. Instead of opening correctly it was just spining around completely without stopping. I have ordered parts and will have to take out the dash to replace the items.