Re: 98 dodge dakota sport , air conditioning troubles
Temporary solution - I found that the pump under the hood gets stuck intermittenly from dirt getting behind the clutch assembly where the belt drives the unit. Blast the back with air then apply Silicone spray (Not WD40) to help keep things running smoother. The wiring connector gets rusted or loose sometimes as well. Also, if the dash gets too hot in the summer, the selector switch contacts don't work right and the damper under the dash gets hung up and wont open or close the air to the vents. I've been fighting this almost 5 years now. It's been in the shop 6 times - NO HELP THERE! Good luck!
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Roger it sounds like the blower motor is not comming on. There is a resistor network located in the engine compartment on the passenger side mounted to the firewall, that controlls the blower motor. The connections may have corroted or the unit itself is bad. That was the first thing I had to relpace when I got my used 92 Dakota. There is also a 30 amp fuse in the fuse box under the dash board . If that is blown I would suspect the blower motor is seized up or just pulling too much power.
If its a throttle body, try cleaning the Idle Air Controller (IAC). This is for a carborated engine but its not much different for a throttle body http://dodgeforum.com/forum/dodge-ram-van/68174-diy-how-to-clean-the-iac.html .They get gummed up and wont thet the truck idle properly. The other thing that could be a problem is the MAP sensor. I would start by checking the IAC, its cheap (cost you a bottle of throttle body cleaner) and easy. I read somewhere you can pull the harness off the MAP and if that fixes the problem, then the sensor is bad, but who knows if that is really the problem. When you clean the IAC clean the whole throttle body just to be sure that isnt the problem. Hope that helps.
I would check the AC or blower fuse to start with. If you have the drivers manual it will show you where the fuse box is. Typically there are at least two boxes to check. One in the Engine compartment and one in the passenger cabin.
Look inside the lid of the fuse box to see which fuse may apply to the AC circuits or the blower and check to see if they are blow. the metal link between the two posts that plug in. If the link is missing you need to replace the fuse with one of the same rating. Make sure you know where you took the fuse out from and put it back in the same slot if its good. Check all the main fuses if possible to see if any have blown and replace if they have.