mojave heater

Just received the heater and plenum from Summit this afternoon. Looking for ideas and tips on installation, with primary desire to drill as little as possible and keep 75 CJ5 stock.

The Mojave will be an additional heater and stock heater will remain functional. This means the mojave ain't gonna fit under the dash. My #1 location is under the drivers seat bolted to the floor. Wiring would run through the loom at the door threshold to a relay and switch close to the fuse box.

I plan to use primarily copper tubing to run from the heater to the original heater core inlet/outlets under the battery. Short lengths of 5/8 heater hose would be used to connect the pipe to the heater core fittings.

Anyone see any pitfalls in this plan or a better location for the heater itself ?

 

You are going to be toasty!
Is it going to blow out at your feet? They are hot.

 

It sounds like you have a good plan. I think you will be fine pointing it straight forward as the plenum has closable vents on it. Since it doesn't sound like you will be hooking up the defroster to the side vent you could still attach a tube so your passenger can adjust the heat direction, or if you get a really cold day you can put the hose inside your jacket and keep yourself really toasty.

 

Why not just pull the stocker out and replace with the Mojave??? Seems overkill to me. From what I have seen the Mojave is more than capable to heat the entire Jeep. Plus, I would think you could tuck it up under the dash much better than the stock piece. I plan on doing this, well, I planned on doing this before this winterR) But, it hasn't happened. I sure would like to hear how great it is after you get it done.

Good luck

 

I too ordered this heater from Summit. With free shipping I couldn't resist. Well, actually I got the sumit one that was 30 bucks less and seemed to have more of an output. My stock heater is missing parts and rather then going through it, fixing it and rewiring it, I plan on pulling the entire unit out. This should free up alot of space too. I was gonna put it under the dash blowing on the passengers knees, or maybe centered. Should be here today or tomorrow.

 

kinda O/T.....is it possible to set up the mojave to pull air from outside, or does it just recirculate the inside air?

not that it matters with all the non-engineered ventilations that comes standard on jeeps (drafty tops and door seals!)

just curious



with the reviews this thing gets i may replace the factory heater in my jeep with one of these when i get to that point!

 

What is the reason for full lenght copper tubing? I am a little more lazy and would just run standard heater hose. I have noticed that todays hose seems alot better than the hose you used to buy 15 years ago.
The heater sounds awesome, you should be able to wear your flip flops in January! Make sure you post your results, many of us would like to hear how it goes, pics would be a bonus.

 

Boyink, the heater looks exactly like that.

 

I wouldn't use the copper tubing for the same reason not to for a fuel line, it will crack from the vibration over time and leave you stranded or worse yet cause engine failure. I would use heater hose or some of that braided stuff from Summit if they carry it. Just my $.02

 

Boyink....thats an awesome location, but I wasn't planning on removing the entire dash ! I'm sure you have measured clearance a couple of times , but are you positive you will have room for all your gauges, etc?
If I remember correctly, you've done a re-design on your dash and have probably made allowances for the heater. I would like to leave mine original. Are you planning on having outboard vents? That would be so cool (actually HOT) !!

Willysnut....appreciate the feedback. I had not considered that the copper lines might crack from vibration. The regular heater hose would sure be a lot easier and cost less but I have a couple of 90 degree turns to make and I didnt want a kink to form. I suppose I could use 90 degree elbows at the turns with hose clamps, unless someone has a better idea..

Thanks for all the replies. This little project will be tackled this weekend and I will plan on posting some pictures.

.

 

From Wikipedia: Some materials (e.g., some steel and titanium alloys) exhibit an endurance limit or fatigue limit, a limit below which repeated stress does not induce failure, theoretically, for an infinite number of cycles of load. Most other non-ferrous metals (e.g., aluminium and copper alloys) exhibit no such limit and even small stresses will eventually cause failure.

Steel is a much better structural material than aluminum or copper.

 

Boyink........can't wait to see that baby finished. One great looking dash.

I like your vent arrangement, very functional. By merely closing both left and right that will automatically direct all airflow to the defroster. Should be more than enough output. Once the windshield is clear, warm air can be channeled in any direction via the vents...side windows, floor, straight back to the rear.

These types of heaters have no temperature adjustments (no blending hot/cold air), just blower speeds. Once the cabin is warm, I think low speed will be adequate in most conditions.

I'm still mulling it over, but in my application, the 5/8" heater hose routing is looking better all the time. Anyone used springs inside of hoses at bends to keep them from kinking? I know some radiator hoses are manufactured that way.

 

That sleeve idea sounds good, better than spring that will break down over time The less elbows and clamps the better.

I had no idea they were that small thanks for the pics!!

Anybody have a pic of the 3b defroster installed.
Wounder if it could hookup to one of those?

 

Well, finished up the project this morning. It went remarkably smooth. Only one trip to Lowe's to pickup some 1/2 copper stock and flux.

This baby is NICE..my factory heater could only produce 105 degrees..this baby goes up to 120 degrees ! Found a 2 1/2" vent hose at AutoZone that fit the mojave plenum perfectly and expands out 72". Manufacturer: Motormite...MightyFlow Part # 96004. I plan on keeping a small towel in it and directing the flow to the dual vents. When needed as concentrated heat, such as defrost or passengers in rear, pull the towel out, close the vents and hold on !!

Three speed motor is quiet on postions 1 and 2 and not bad on 3 either. Much quieter than factory unit. All in all, a great upgrade and, bring on the cold weather !!

 

THAT'S a CLEAN Jeep!
You gonna be warm.

 

Looks great! Nice clean install. So plumbed in series, which heater gets the heat first? Sure will be nice to put your stock heater on full defrost and use the other to heat. Did you end up going hard, copper, line to your aux. heater? Again, great install. So when is the A/C unit going in?