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Unread 10-24-2013, 06:24 PM   #1
Little Green
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1991 FSJ Wagoneer 
 
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Heat or lack thereof

It's gotten cold and the wife is *****ing about the lack of heat in the waggy. Just not getting much air into the cabin. Used the search feature but ut sucks on an iPad. Looked and could not find anything specific.
Figured I can't be the only one that has this issue.
Thanks
Caesar

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Unread 10-24-2013, 07:51 PM   #2
RockRollin
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Clogged vents?
Is the air hot but no volume?
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Unread 10-24-2013, 08:09 PM   #3
Little Green
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Hardly any heat and no force
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Unread 10-25-2013, 04:26 AM   #4
RockRollin
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If the hoses on the the heater core are getting warm Chances are you have a compacted heater core, provided the fan is working at all settings. Pull the heater core and clean it and the housing of debris. Then chase the debris as far as you can. If you pull the fan you'll see.
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"I like fun" Edd
Clawed: 90GW, TFI, Streetfire, 3"lift all spring, 31"BFG ATs, working RKE, Edel2131, Holly 1850, mild cam,
05 Renegade OME 927, 947, top plate, JBA 4.5s
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Unread 10-25-2013, 04:46 AM   #5
Little Green
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Rock
Mind my stupidity but where is the heater core located. Is it the black box on the passenger side against the firewall in the engine bay with the screws holding the two sides together?
Thanks
Caesar
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Unread 10-25-2013, 05:41 AM   #6
RockRollin
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Yea man, that's the one. Are the hoses warm?
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Clawed: 90GW, TFI, Streetfire, 3"lift all spring, 31"BFG ATs, working RKE, Edel2131, Holly 1850, mild cam,
05 Renegade OME 927, 947, top plate, JBA 4.5s
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Unread 10-25-2013, 08:36 AM   #7
Colowagon
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Had the same issue...air sorta oozed out of the vents...turned out to be the hard 1/8th vacuum line on the back of the dash switch that connects to the vacuum ball on the firewall. No vacuum to open the switch to allow air into cabin. Three dollar fix and only a little bit of blood from scraped knuckles!

-Brad
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Unread 10-25-2013, 09:02 AM   #8
Little Green
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How do you access that hose
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Unread 10-25-2013, 09:13 AM   #9
Colowagon
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Pull the dash cover and remove the two screws to access the back...its a hard line and thin enough that it difficult to tell the difference between it and the other wires. Might be easiest to run it from the vacuum ball on the firewall and trace it back through the firewall.

Brad
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Unread 10-25-2013, 04:40 PM   #10
Little Green
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Ok I must be stupid.
Tried to take all the small screws
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Unread 10-25-2013, 04:44 PM   #11
Little Green
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Ok let's try again. I tried unscrewing the small screwball around the box. I got the half and underneath but clearly can't get the ones along the firewall. Ok well I will remove the box altogether by removing the 2 screws. Nope. No dice. Well I will remove the blower fan. 2 screws. Nope. Can feel any other screws. What am I missing. I have the service manuals and it shows a diagram of the entire unit but nothing on removal
Any ideas as to what I am doing wrong?
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Unread 10-25-2013, 04:52 PM   #12
Colowagon
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I will get more detailed with some pics when I get home...

Brad
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Unread 10-26-2013, 09:38 AM   #13
AF-Jeff
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The previous owner of mine yanked the heater core out and tossed it in the back. I'm pretty sure i chucked after a quick check to see if it was worth anything. Luckily I'm in AZ
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Unread 10-26-2013, 11:04 AM   #14
Colowagon
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So here is what I did...
first pulled the blower motor to see if anything was compacting in there...also ran the motor where I could see the squirrel cage moving to verify it was working...

I then checked the hard vac line from the top of the ball on the firewall to where it entered the cab...This is where mine was broken.

While doing all of this I also pulled the Heater Core to clean it out...There are two ways to do this as there are four bolts holding onto the firewall. Two are on the "outside" accessible from the engine bay and two are located on the inside of the firewall. Either drop the AC entirely to reach the inside bolts (easiest to get the bolts out, but the most painful int he long run), or remove the stereo and get your kids hand in there to loosen up the two inside bolts...I went the AC route not knowing I could reach from the stereo...ah well, it's winter who needs AC right?

Finally check the hard vac line as it comes into the CAB and all the way to the back of the switch. Mine had a little female connector there and it was pull and play for running the new line. I hope this helps!!

-Brad
imag2649.jpg   imag2650.jpg   imag2647.jpg   imag2648.jpg  
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Unread 03-12-2014, 11:20 PM   #15
mpatch
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can anybody tell me what the two hoses are in pic two above the blue and green wires? Starting to get in to why I have no hot air blowing. I have two tubes around that arae that dead end into one tube via plastic contector and they are just sitting on top of my heater core. Wondering if that is where I should start.
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