Defrost

jamesdeanblvd · 10-31-2009, 11:37 AM

Ok, I'm driving down the road in my 97 Wrangler Sport and I hear this "POP" from my dash, and all of a sudden my defrost isn't coming from the center. It still comes from the side of dash on defrost, if you put it on floor/defrost, the floor works, but, it still won't come out of the center. Before I tear into it, I'd kind of like to know what I'm looking for. Any thoughts?

jamesdeanblvd · 10-31-2009, 11:45 AM

Everything else seems to work great. I can move the selector and everything seems to change, floor, vents, etc. I have read other posts and I can't find another one that talks about a "pop" sound and then center defrost only going out.

**tlrrob1000** · 10-31-2009, 12:14 PM

You may have just lost the ducting for the center vents. I should say that the ducts may have popped off. Look inside the vents.

jamesdeanblvd · 10-31-2009, 05:52 PM

Quote:

Originally Posted by tlrrob1000

You may have just lost the ducting for the center vents. I should say that the ducts may have popped off. Look inside the vents.

Ok, I've looked underneath the dash, and moved the selector for the heat-defrost, and everything under the dash seems to be working. The diaphrams all move and close as they should. I have tried to look through the defroster vent and I can't seem to see anything. I am going to try and look through the center vents and see if maybe I can see anything there.. The ducting for the defrost is definately still hooked up to the main heater-blower box. Is there a flap that opens to release the warm air to the defrost? If so, will it make a "pop" noise if it springs shut. I've looked through the service manual and I really can't find a lot of diagrams on the defrost system.

jamesdeanblvd · 11-01-2009, 09:57 PM

Any more thoughts? I hate to pull the steering wheel and pull the dash if I don't have too. I'm willing to try anything to keep from pulling the dash out.
Thanks again for your help.

tom1948 · 11-02-2009, 02:01 PM

The defrost in my 1997 TJ quit working. Everything else worked fine. You may have the same problem that I had. No need to pull the steering wheel or the whole dash. Remove the plastic panel under the steering wheel (2 screws). Behind this panel is a steel panel with 4 screws, remove this panel. You should be able to see 3 vacuum actuators. With the engine running move the heater/defrost controls to see if all of the arms are moving.
The arms connect to plastic levers with a hook on the end. If one of these levers is broken, the door to the defrost won't open. Tellico 4X4 has replacement parts for about
$14.00 each. They are a PITA to replace, but much cheaper than going to a dealer.

jamesdeanblvd · 11-03-2009, 10:51 AM

Quote:

Originally Posted by tom1948

The defrost in my 1997 TJ quit working. Everything else worked fine. You may have the same problem that I had. No need to pull the steering wheel or the whole dash. Remove the plastic panel under the steering wheel (2 screws). Behind this panel is a steel panel with 4 screws, remove this panel. You should be able to see 3 vacuum actuators. With the engine running move the heater/defrost controls to see if all of the arms are moving.
The arms connect to plastic levers with a hook on the end. If one of these levers is broken, the door to the defrost won't open. Tellico 4X4 has replacement parts for about
$14.00 each. They are a PITA to replace, but much cheaper than going to a dealer.

Thank, I didn't notice any of them being broke when I was looking at the vacuum pumps, but, I will pull the panel and check it out right now..

tom1948 · 11-03-2009, 02:06 PM

Look on the Tellico 4X4 website and do a search for part numbers 17910.01 and 17910.02. these are the parts I'm talking about.

10-31-2009, 11:37 AM	#1
jamesdeanblvd Jeeper Join Date: May 2009 Posts: 90	Defrost Ok, I'm driving down the road in my 97 Wrangler Sport and I hear this "POP" from my dash, and all of a sudden my defrost isn't coming from the center. It still comes from the side of dash on defrost, if you put it on floor/defrost, the floor works, but, it still won't come out of the center. Before I tear into it, I'd kind of like to know what I'm looking for. Any thoughts?

10-31-2009, 12:14 PM	#3
tlrrob1000 Supporting Member WF Supporting Member Join Date: Jul 2009 Location: SoCal in the new 909 the 951 Posts: 227	You may have just lost the ducting for the center vents. I should say that the ducts may have popped off. Look inside the vents. __________________ No Bad Days!

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10-31-2009, 11:45 AM	#2
jamesdeanblvd Jeeper Join Date: May 2009 Posts: 90	Everything else seems to work great. I can move the selector and everything seems to change, floor, vents, etc. I have read other posts and I can't find another one that talks about a "pop" sound and then center defrost only going out.

11-01-2009, 09:57 PM	#5
jamesdeanblvd Jeeper Join Date: May 2009 Posts: 90	Any more thoughts? I hate to pull the steering wheel and pull the dash if I don't have too. I'm willing to try anything to keep from pulling the dash out. Thanks again for your help.

11-02-2009, 02:01 PM	#6
tom1948 Newb Join Date: Jun 2009 Location: Orion MI Posts: 4	The defrost in my 1997 TJ quit working. Everything else worked fine. You may have the same problem that I had. No need to pull the steering wheel or the whole dash. Remove the plastic panel under the steering wheel (2 screws). Behind this panel is a steel panel with 4 screws, remove this panel. You should be able to see 3 vacuum actuators. With the engine running move the heater/defrost controls to see if all of the arms are moving. The arms connect to plastic levers with a hook on the end. If one of these levers is broken, the door to the defrost won't open. Tellico 4X4 has replacement parts for about $14.00 each. They are a PITA to replace, but much cheaper than going to a dealer.

11-03-2009, 02:06 PM	#8
tom1948 Newb Join Date: Jun 2009 Location: Orion MI Posts: 4	Look on the Tellico 4X4 website and do a search for part numbers 17910.01 and 17910.02. these are the parts I'm talking about.