Blower Motor Speed - It was suggested that I replace the blower motor resistor on my 1999 Jeep Wrangler. The fan speed doesn't change between speeds 1,2 and 3 and speed 4 blows hard.
I changed out the resistor last night and had no change. It's still doing the same thing as before.
Also... Why does my heater never heat up? It blows warm, but never enough to do any good.
Thanks
BJ
BJ
I'm using the comment section of the original posting to communicate with you.
Pat
Testimonial: "I'm replacng the switch tonight and I'll let you know."
BJ
This additional Posting you left with your rating on 2. Could you change that please?
Pat
ps...How is it going?
I'm glad the first issue has been taken care of!
Three (3) possibilities:
(a) The Heater Core is Bad.
(b) The Blender/Blending Door is non-operative/malfunctioning.
(c) The Temperature Selection Switch is bad (one of my concerns).
Was the Switch you replaced just for the Speed, or was it for the whole thing (Speed & Temperature Adjustment)?
1. If the Heater Core is bad, it will usually not heat-up. Blockages. sediments...etc will prevent it from heating-up. Run the Jeep until it reaches normal operating temperature. Turn on your Heat (on high) On the Defrost setting. In the Engine Compartment near the Fire Wall on the side where the Heater Core is: Identify the Heater Hoses: and carefully touch the Hoses to check each hose (to the heater core/return hose from the heater core). At least one should be hot and the other - a little less hot. If none of the hoses are hot: you have a problem coming from the engine (thermostat or water pump) or you have a completely blocked heater core. If only one is hot, then you definitely have a malfunctioning heater core (not aloowing flow) Expose and touch the Heater Core.Be careful - it may be HOT!. If the Heater Core is Hot: then the issue is with the Blending Door and not the Heater Core. If it is Cold: WAIT FOR THE JEEP TO COOL and the remove it and flush and "back flush" it attempting to remove any possible blockages. Reinstall the Heater Core and repeat. If still Cold: Replace the Heater Core.
2. The Blending Door mixes the air: heated air from the heater core, cooled air from the ac unit (when on ac), with a varying degree of fresh air to reach the desired level based upon the Temperature Switch you dialed/requested on the console. In a case that the blending door is malfunctioning, it is stuck to the open (fresh air) position; thus the cold air.
3. If you only replaced the Speed Switch and not the whole panel controlling everything (Speed, Temperature and Directional) then the Temperature Switch could be non-operational. As previously stated and related on the other problem: If the Speed Switch overheated, it could have very well rendered this Temperature Switch useless.
My first guess will be the Blending Door. But the easiest to check first of the Heater Core. If the Blending Door is suspected then you will NOT see movement when the "good" Temperature Switch is changed. It will not move. Of Course: check for voltage coming from the Temperature Switch, If no voltage = problem with the Temperature Switch and not the Blending Door (or so we hope!). If there is voltage and no movement while you are changing the Temperature Switch Settings = Blending Door mechanical/electrical failure and must be replaced.
Well we hopefully will get you fixed before Summer!
Get back with me and let me know.
Thanks BJ, it has been fun working with you.
Pat
Sorry for the delay...I checked for 5-days for a response from you, and when I found none, thought you were set!
Because there is no flow going thru both the hoses:
I would remove both those hoses at the fire wall connections within the engine compartment. We have to assure there is a fluid flow coming from the engine. If there is no flow of fluids - there is a problem with the Water Pump or blockage in the system. No flow right now means either a blockage in the Heater Core, or a problem within the Engine with the water pump of a blockage.
My bet is a Heater Core Blockage, but I want to rule out the engine.
Disconnect those two hoses, turn on the Heat (On Defrost), on High and start the vehicle. Use a large pan to catch the radiator fluid. Is there any flow? If you have flow: Plug or clamp-shut the Hoses ( I use flat/needle nose shaped vice grips) and let the engine warm up, and release the Plug or clamps. Be careful the fluid will be HOT! Is there flow still? If no flow: there is a blockage in the engine system or there is an internal failure of the water pump. I doubt it, but it has to be ruled-out. Saving the engine versus getting heat!
If there is flow: There are several ways to further diagnose this. Let the engine compeletely cool. Drain and catch the Radiator Fluid, draining the entire system. You will re-use the Radiator Fluid using panty hose and or nylons as a filter later after it cools.
Remove the Heater Core and flush it and back flush it. It you cannot get fluid to flow thru it, replace the Heater Core.
Let me know...
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SOURCE: i have a 1999 Jeep Wrangler and the heater fan
If you bypass the resistor pack and connect the motor directly to the fused 12v supply then the fan should run at maximum speed. If so, it's the resistor pack that's blown: a very common fault on a huge number of makes and models.
Welcome to FIxYa.com
Blower Motor Resistor and Controller Replacement Image Blower Motor Resistor Or Controller/Power Module Remove/Install REMOVAL 1. Disconnect and isolate the batten' negative cable. 2. Depress locking tab and unplug the wire harness connector
from the blower motor resistor or controller (power module). 3. Depress locking tab and unplug the resistor or controller
connector from the blower motor. 4. Remove the 2 screws that secure the blower motor resistor
or controller to the heater-AC housing. 5. Remove the blower motor resistor or controller from the
heater AC housing. INSTALLATION 1. Install the blower motor resistor or controller to the
heater AC housing. The housing is indexed to allow (controller power module)
mounting in only one position. Tighten the mounting screws to 2.2 Nm(20 in.
Lbs.). 2. Plug in the wire harness connector to the blower motor
resistor or controller. 3. Plug in the connector from the blower motor resistor or
controller to the blower motor. 4. Connect the batten' negative cable.
Thank you for using FixYa.com
Regards, Lee Davidian
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Installed the switch...
It worked. The blower speed is working correctly now.
Moving on to the next issue. I have no heat at all. Blows only cold air. I had mentioned this before, but at that time (a week ago) it would blow out warm air, but never really seem to heat up fully. Now its just blowing cold. This actually started just before I installed the new switch.
Any ideas.
Thanks for the help.
Finally getting back to you on this...
The last posting I got from you, listed (3) possibilities on the problem I'm having with no hot air coming out of the heater.
I made (what I think anyway) is one important discovery... When I turn the temp control knob, there's not much of a change at all in the temp of the air blowing out, but there is a change. It's very slight, but it seems to me, that would rule out the switch being bad, right?
Having said that. My next test was checking the hoses to the heater core. I ran the Jeep to normal running temp and turned on the defrost and cranked the heat up to max. Let it run for a few minutes and checked the lines. Both hoses were cool (or at least not hot, not really even warm either).
According to your last post, this would indicate that I need to remove and flush the heater core.
Can you give me some help with that?
#1 - Do I access the core from inside the cab (behind the dash) or from under the hood?
#2 - What is the procedure on flushing it out?
#3 - Do I have to drain the radiator first to do this?
Thanks
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