Heater Questions

#1- Why are there two "nozzles" coming out of the top of my heater box. The de-froster tube connects to one and there is an identical one just to the left. :?

#2- What is the "nozzle" for that is at the bottom of the molded plastic housing just below the cowl grill. It's apx. 1 1/2" dia. and must connect to something with a hose ???

Thanks for any help, Jim

 

If you have the means pics would be helpful. I will give it a shot.

1) On my 79 there is one hole with a defroster duct that channel into two, is it possible that yours is made with two individual defroster ducts for driver and passengers sides?
2) I believe the “nozzle” or cup should have a drain hose attached to it. Its function is to drain the rain water that goes through the cover panel.

 

I think Chuck is right. on my 75 the nozzle under the cowling is a drain, The two nozzles if they are the same ones are located in the plenum (cen of jeep in front of the tranny) has two hoses up to the windshield defroster. The plastic attachment is missing so I just squeezed the heating duck togeater until it would fit through the defrost holes. Spread it a little after putting it through and it should work great.

 

Thanks for the quick responses guys! The hole in the bottom of the housing under the cowling certainly makes sense, but where is it supposed to drain to? The "nozzle" or fitting molded into the cowl airbox is apx. 1 1/2" dia. Seems kinda large for a drain hose.

There is a hole in the firewall (1 3/4" dia.) that appears to be factory and is located above the pass. left foot. Any ideas??

As for the two outlets on top of the heater plenum, should one simply be plugged? The defroster attatchment is designed to accept only one hose.

One last question: since the heater fan has a two speed motor, should a 3 position toggle switch control it properly?

Thanks again, Jim

P.S. Happy Labor Day :stout:

 

Here

 

Funny, this question came up at this particular time. This last weekend I spent an inordinate amount of time working on the heating/defroster on my 75 CJ5. I had picked up (from Turner's) the plastic replacement duct for the defroster and it was a pretty easy swap. Should be a huge improvement over the cardboard original equipment.

The drainage hose from the cowl vent drains to the opening just above the passenger footwell..underneath the battery box location. At the rear of the cowl vent is the 'door' that allows air to enter the passenger compartment. It is adjusted by the far left air control. Any water entering the cowl vent is routed throught the drain hose.

Your other question, I don't have the answer. Even my 75 factory service book does not mention the two openings coming out of the top of the heater box. The schematic shows the right (as you are facing it) nozzle being connected to the defroster hose that leads to the center windshield vent. The left nozzle, apparently remains open and I presume just directs warm air to the entire region.

Two of my 'flaps' connected to the controls were frozen and a liberal dose of WD40 to the assemblies freed them up. Along with the replacement duct, I should have a decent amount of warm air to route around the windshield and foot area. In the past, with a fully warmed engine and temperature in the 20's,the best results resembled a trembling Chihuahua panting on your leg.


Just a general question..........on restorations or in my case....I call it....Just Getting Everything Working Again...........how do you avoid getting sidetracked ? While replacing the vent with the windshield down, I noticed how grungy the rubber seal between the windshield and body had become over the years. Twenty screw removals later. I had the entire strip off. Thorough cleaned it and gave it a liberal dose of 303 and after thoroughly cleaning the mating surfaces, reinstalled the piece. Took an additional two hours to finish up. I'm not complaining..to me this is quality time, just tinkering and restoring..but it is very time-consuming. Anybody else get caught up in this compulsion ?

One last question.........in the windshield frame itself, I noticed a fair amount of surface rust. This is an impossible area to reach except for the removal plugs for windshield motor/arm work. Is there anything I can do to help slow-down this rust progression? thanks

 

I can relate to the compulsion...I started with taking the r. front fender off, just to see how easy/hard it would be, and my Jeep is down to the frame now. So, I HAVE to restore it now, I can't bring myself to reassemble it all cruddy. Guess I need to buy a driver Jeep, so I can have fun in the meantime whilst I'm restoring Ol' Red.

 

Speaking Of Heaters

During my first government paid visit to Fort Cartoon I saw a M151A1 "Mutt" with a "flame" heater in it. Does anyone know if such an animal exist for the CJ5?

 

Springerfever, got my heater working like new!!!
Thanks for the info. on the cowl drain routing. That jogged my memory into recallig my Brand New 74's arrangement . I think there was a rubber boot with a slit in it on the eng. compartment side of the drain opening so as not to allow bugs and critters in.

The other opening on top of the heater plenum must be plugged or the blower will force all the air up under the dash even if it's in the de-froster position.

Regards, Jim

 

JMB

The other opening on top of the heater plenum must be plugged or the blower will force all the air up under the dash even if it's in the de-froster position..

I think you meant to say " even if its in the heater position." Correct me if I'm wrong.

Stopped by Turners Four Wheel Drive yesterday and asked Gene about the two openings. He thought they probably planned on two outputs to the windshield defroster and then just before production decided to go with the one. I was thinking maybe that particular plenium might have been used on other models, but Gene said no. Anyway, I'll be looking for the perfect size cover to block the left opening to increase output to the right. A Pringles can cover looks about right !

 

I used the cap from a can of black spray paint.

Karl

 

iamgeer

Thanks !! regular spray can cap fit perfectly! This has been a good week.....heater back in operation and all gauges and lights are functional....emergency brake straightened, repainted and ready for
installation....no more chock required ...(I'll still keep it handy !)

Now to move on to next project........Rust Prevention !

Leaning towards the POR15 products....looks like folks have been pretty happy with results over the years..

 

Hi Jim,

Do you have a camera by chance? I'd love to see pictures of the whole setup. My 74 was stripped of (I believe) every heater component. The cowl vent still has a level attached to it and the drain house, but everything else is gone. I'm gonna take my camera out this afternoon and take some pics. I gotta get moving on the thing or I'm gonna freeze this winter.

I've seen a couple after market heaters, in JC and 4WD, anyone had any luck with them?

- J.

 

Wish I would have read this thread earlier. I went through all these same questions when I was restoring this '74:

http://community.webshots.com/album/255805953reZNXk/0

I scrapped the original heater considering how hard it is to get parts for them. I used a Flex-A-Lite Mojave heater. Easy install. Great fit in the stock location. Great heat. I opted not to go with the defroster plentum that they offer b/c it just took up too much room...

 

Wow Tim! That's looks great. Where are the controls mounted and what do they look like? Did they come with the package?

 

Thanks!

The "controls" came with the unit. It's a nice rotary switch. Looks right and home in the dash.

 

I'm looking at trying to get heat in my jeep mostly for defrost since inside ices up so bad here in Northwest Alaska. That plenum - I took a look at it on some websites and it looks like it might stick out in the way. That may sway me to Heatercraft. Did you think it would just be too much in the way?

cheers, Jim