Defrost weak. - JeepForum.com
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post #1 of 18 Old 01-20-2008, 09:17 AM Thread Starter
Bubba Ray
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Defrost weak.

My defrost can barely be felt but the heat blows ok at floor. Any ideas that do not involve removing heater box?

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post #2 of 18 Old 01-20-2008, 09:21 AM
Cherokeester
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Check the accordian type connection back behind the dash from the floor up to the defrost vents. It is very common for these to disenegrate and become useless.

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post #3 of 18 Old 01-20-2008, 09:40 AM Thread Starter
Bubba Ray
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Thanks Cherokeester, will head out now and take a look.
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post #4 of 18 Old 01-20-2008, 10:01 AM Thread Starter
Bubba Ray
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The accordian hose looked ok from what little I could see. Most of it was hidden by the radio. Is the best way to check this by pulling the radio?
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post #5 of 18 Old 01-20-2008, 10:04 AM
Cherokeester
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Put your hand down in that area with your defrost pulled out. Check and see if you can feel any air blowing around the hose. Usually blows at the joints because they wear out first.

1980 CJ-7 with a AMC 401, RE 4.5" Lift, 4-1 Dana 300, Holley TBI Projection, 35" Goodyear MTR's
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post #6 of 18 Old 01-20-2008, 10:09 AM
Fatman
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You might be able to lay on your back and look up behind the radio.

Pic with out the accordion hose:



Have you done the "Heater Blower Fan Upgrade" ? BIG difference


.
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post #7 of 18 Old 01-20-2008, 10:31 AM
HighCountry
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Another little 'free' thing to check is to pull those oval wiper linkage inspection plugs out of the windshield frame and see if the whole thing is full of leafs and such!

Step # 2 is to verify that the rubber seal between the windshield frame and the body is sealed. A lot of your 'hot air' will escape through there if it is not a tight fit!

Bruce
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post #8 of 18 Old 01-20-2008, 12:06 PM
jp360cj
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if you've still got the stock blower motor, then you should probably upgrade to the chevy blazer one. there are lots of threads on here about it. My stock blower motor worked just fine, but with the defrost on, it would not clear the windshield, even after driving for 30 minutes. I switched to a chevy one and now the windshield is mostly clear after 5 to 10 minutes.

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post #9 of 18 Old 01-21-2008, 03:49 PM Thread Starter
Bubba Ray
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I have not done the blower upgrade because heat has been ok. Is it possible that when I pull the defrost knob out that it is not open/closing a flap somewhere?
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post #10 of 18 Old 01-21-2008, 04:08 PM
Mike Romain
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Quote:
Originally Posted by Bubba Ray
I have not done the blower upgrade because heat has been ok. Is it possible that when I pull the defrost knob out that it is not open/closing a flap somewhere?
If the floor stays on when you pull defrost, then yes, it is disconnected some place. It is the lever on the left above the heat one on the box in that photo

Mike
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post #11 of 18 Old 01-21-2008, 06:47 PM Thread Starter
Bubba Ray
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Found it. Cherokeester got it right. I could feel the air coming from the hose and then could feel the cracks. Is it possible to replace the hose without removing the radio?
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post #12 of 18 Old 01-21-2008, 07:19 PM
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You can do it without moving the radio but it's a pain in the butt. You have to be somewhat of a contortionist but you can put a new one in without removing the radio or the dash. Or you can quick fix it till summer by wrapping a load of duct tape around it, but that can be as hard as putting a new one on sometimes.

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post #13 of 18 Old 01-22-2008, 06:25 AM
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The replacements are made by Omix-ADA (AKA Rugged Ridge) and the one that I bought was 2 small to clamp onto the heater box. The clamp broke and I ended up using black duct tape anyway.
I hope that you are flexible. That little piece of ductwork is a pain in the ***, neck, shoulder.......

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post #14 of 18 Old 01-22-2008, 08:30 AM
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Folks, that ducting is available in 25 foot Bulk boxes at NAPA. We used to cut off peices and sell it by the foot! It doesn't have 'buit on' clamps, but HD wire ties work just fine!

Bruce
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post #15 of 18 Old 01-22-2008, 08:32 AM
docbob
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Quote:
Originally Posted by Cherokeester
You can do it without moving the radio but it's a pain in the butt. You have to be somewhat of a contortionist but you can put a new one in without removing the radio or the dash. Or you can quick fix it till summer by wrapping a load of duct tape around it, but that can be as hard as putting a new one on sometimes.
I did the blazer fan upgrade, and I'm thrilled with it... first time I've actually felt heat in the 4 years I've owned my Jeep!
In the process I discovered my accordion vent was toast too ... I did the duct tape trick, which was a pain... but it worked!!!
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