hey guys,
i replaced the blower motor in my 97 XJ, the old one was groaning and growling and coming on and going off randomly. just finished replacing it with a new one and when i start her up i hear the fan just fine but i don't get any air coming out of the vents. what have i done?

also, i know my blower motor resistor wiring harness needs replaced, at some point it melted. i have all my settings with exception of setting 3 where it melted.
thoughts?

 

the new one also seems to have a slight whine which worries me a bit.

 

You can hear the motor running but is the fan turning?

You can get a look at the fan through the glove box opening.

Roll down the glove box by removing the two rubber stoppers and let the box hang down. The pic below shows the glove box removed but you don't need to do this.

Look in at the Recirc Air Door inlet. If the door is open you can see the fan.

Turn the Mode Selector to MAX AC (Recirc Air). See pic, selection 11. Start the engine to get vacuum to the door actuator, the door should now be open.

Look in at the fan using a flashlight and see if it's not turning, or turning slower than the fan speed switch setting (judgement call).

If there is a problem, the blower/fan assembly needs to be replaced.

If the fan seem to be turning okay you have other problems.

 

thanks CCKen, heading out to check it now.

i did notice just now after poking around with the resistor that the blend door wasn't opening or closing when the switched was moved. you mentioned starting the engine, does it matter if the car is simply on versus the engine being fired up?

 

just checked through the glove box, the door doesn't open

 

after the car was running for a bit, its official, the fan is turning.
has a whine to it still and still no air from the vents?
vacuum leak? or something else

 

the door opened thats how i was able to see the fan

 

The Blend-Air Door is controlled by the Temp Select **** (see pic), is this the switch you are talking about?. Full Red=Full hot, Full Blue=Full cold.

Engine running provides the vacuum required to operate the doors in the HVAC unit. Normally, when you turn the Mode Selector to OFF and shut down the engine, the Recirc Door goes open and the Defrost Door goes open. If the Recirc Door was open when you looked in there there was no reason to start the engine, provided however, the Mode selecor was set to OFF or Recirc.

Did the fan speed respond to the fan speed switch settings? That is, low setting - fan turns slow, high setting - fan turns noticeably faster.

If nothing else, if the fan is turning, you should have airflow out of the defrost outlets .

 

What brand is this motor/fan? Where did you buy it?

 

sorry i misspoke, the door i was referring to earlier is the recirc door that you mentioned. once i started her up, the door opened with the switch.

the fan responded to the speed switch as it should.

i do have defrost

 

picked it up at o'riley. its a VDO PM6002.
i will say i didn't particularly like the plug. it doesn't seat as nicely as it did in the old one.
its definitely getting power though.

 

i checked at auto zone as well and its the same brand/model

 

So you're saying you are getting airflow from the defrost outlets, and nowhere else? True?

If only out of the defrost outlets no matter what you select on the Mode Selector, it would make me think you have a vacuum leak in the engine bay (very common).

 

yea, that was my guess as well. i looked all through the engine bay and didn't see anything. i've heard some people saying they have a leak behind the switch inside the cabin. is that a possibility?

any thoughts on the whine of the fan?

thanks for all your help CCKen

 

Here's a link that has pics of the vacuum system in your engine compartment.

Click the image and it will enlarge. Look for the magnfying class icon near the top of the page. Click it and the image will get larger.

https://picasaweb.google.com/ken384/...eat=directlink

You can see the vacuum reservoir by laying on your back under the right end cap and pulling down on the plastic fender liner.

If you can't visually find any faults, you may have to remove the battery to see the tubng behind the bttery.