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Shop Kaiser Willys

New Complete Under Dash Hydronic Heater Kit
Fits 41-71 Willlys and Jeep


New Complete Under Dash Hydronic Heater Kit

These are the improved heater core version and now offer 15% more BTU that the old versions. Its everything you need in one package to stay warm!!!

" 6.4H x 9.4W x 9.35D
" Amperage: Low 4.4, Med 5.8, High 8.5
" Maximum estimated BTU/h: 28,000
" 12V DC 3-speed fan or optional 24 V DC
" Air Flow: Low 172 cfm, Med 228 cfm, High 263 cfm
" Hose barb: 5/8
" Weight: 8.1
" 2 year warranty

Looking for additional warmth this winter? This heater is small enough to be mounted just about anywhere and produces an amazing amount of heat for a cold Jeep.

ts also great for early model or custom Jeeps that may have no heaters at all. Originally designed for the marine industry, its easily adapted to your Jeep.

The heat is channeled to where you need it with the supplied 2.5 vent hose. One ducted unit can be used to heat the driver and passenger and the other used as a defroster. The heater unit is finished with a durable powder-coated exterior and stainless steel fasteners for durability.

This heater includes: mounting brackets and hardware, 3-way switch, wiring harness, heater hose fittings, 12 feet of 2.5 vent hose, directional louvers and instructions. Installation requires cutting and custom routing of the heater hoses to the actual heater unit.

Specifications: 12V DC three-speed centrifugal blower, 3.9/5.0/7.7 amperage draw, 172/228/263 CFM, up to 28,00.

Helpful Guides and Illustrations:
Heater Engine Installation Guide

41-45 MB
41-45 GPW
46-49 CJ-2A
49-53 CJ-3A
53-64 CJ-3B
55-71 CJ-5
55-71 CJ-6
50-52 M38
52-66 M38A1
46-64 Truck
46-64 Station Wagon
48-51 Jeepster

Part # Price





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Questions & Answers

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I just acquired a 1971 Jeep cj5. It does not have a heater core. Do I need an original heater core with this product or does it have its own?

Willys Jeep Parts Tech:
This is a complete heater unit all ready to go.

Can this heater be use to heat the driver/passenger and defrost or does it have to be one or the other.

Willys Jeep Parts Tech:
Im sure you could do the duct work and split it with a Y.

I have a 1952 Willys Stationwagon 2WD here in NZ . I would like to know if this model would have originally been manufactured with a heater/defroster. I am wondering whether this product will work with this vehicle and is is hard to install. Thank you. Jan Macmenigall.

Willys Jeep Parts Tech:
Most were dealer installed after the fact.

Do you have any photos of one installed? Considering this purchase, but need to see it installed before I pull trigger.

Willys Jeep Parts Tech:
We may have something in our photo library. Email

do you sale the air intake hose that runs from the radiator housing to the heater for a 1966 cj5

Willys Jeep Parts Tech:

Thinking I might get the plenum unit also and plumb it in so can have on/off directional aspect for defrost/ heat vent distribution. Do you think that's a workable process? I do not see any air channel controls on the heater box ( just the outflow baffles )???

Willys Jeep Parts Tech:
Yes, Im sure it would be. Got any photos of what all your setting up so i can help?

Do I need to buy water hoses for the heater installation?

Willys Jeep Parts Tech:
Yes, you would buy your water hose to fit there locally.

Hi there do you have pictures where you can see exactly where the hose connections for the heater on the engine hurrican 4-134 are

Willys Jeep Parts Tech:
The bypass on your water pump and the rear corner of the top of your cylinder head.

Hi there do you have pictures where you can see exactly where the hose connections for the heater on the engine hurrican 4-134 are

Willys Jeep Parts Tech:
Email and we can try to help out. Thanks!

Does this unit com with a heater coil or do you use the preexisting one?

Willys Jeep Parts Tech:
Yes, it is a complete heater unit.

Will this heater fit a 1948-50 Wagon 4 x 4? thanks Mike M

Willys Jeep Parts Tech:
Yes, it sure will. Here's a link to the install guide: Thanks

I have a 1947 WILLY's A2 that is a 6V system. Can I get this heater in a 6V or will I need to convert it to a 12V?

Willys Jeep Parts Tech:
I'm sorry but as of right now these heaters are only available for the 12 & 24 volt systems. Thanks

Does this have a template for drilling the 3" holes and the mounting screw holes?

Willys Jeep Parts Tech:
You'll have to make a template off the bracket provided with it.

Where do these typically bolt on a M38A1? Does the eye bolt replace one of the dash side bolts?

Willys Jeep Parts Tech:
These can be used on just about any Willys. They will work for all.

Have 48 Jeepster 6 v system. Anybody working on a 6 volt heater or can you keep an eye out for one to recondition?

Willys Jeep Parts Tech:
Sorry, we can only currently get these in 12 volt.

How do you route the defrost? Do you have to cut holes in the dash or does it hang on the outside? Is there a vent for this purpose or do you have to make your own. I will be ordering one but need to plan so I can do whatever cutting I need to before paint, which is coming soon.

Willys Jeep Parts Tech:
It really depends on the vehicle. Please call us toll free and we can try to help you. Thanks!

Does heater have outlet for defrost

Willys Tech:
You can route one in with the kit.

You offer a heater that fits a 42 GPW but is a 12 volt . The 42 GPW is 6 volt. How does that work?

Willys Tech:
Sorry we only have these in 12 and 24 volt currently.

Do you have these in 24 volt?

Willys Tech:
Yes, its part number: HEATER-24

I have the original 6 volt system in my CJ-3A I see since 2010 the answer to the question of do you have a 6 volt heater has been... its in development. By 2013 you replied... hope next year. Well now 5 years , Do you have a heater that works with a 6 volt system? If not, do you think you ever will and if so, please be specific when it will be available. I really have been checking for years.

For those people who want to put a 12v heater in a 6v jeep just add a resistor from 12v to 6v pretty simple to do.
Willys Tech:
Sorry, our supplier has not yet come up with a 6 volt version for us.

Is there a product or installation manual available for this? If not, what else is required for installation? Does it just get connected as a loop in the coolant lines? Would be for a 48 CJ2A that was not set up with a heater...

Willys Tech:
Its pretty straight forward and is just a loop system. We can also fax you over the instructions if you need us to. email us your fax number there.

This has to be better than the original heater. Can you please send me the installation and wiring instructions so I can see what I will have to do to install this heater. I am assuming it is not a direct replacement and some modifications will be necessary. Thanks.

Willys Tech:
Please email and we can fax you over some instructions.

I have a 52 Willy's Pickup. Has been converted and has a Chevy 350 in it. Will this unit adapt to this set up?

Willys Tech:
Yes, it should work just fine. Its an under dash and wont interfere.

Does this kit come with a on/off switch or is that something I need to buy separately .

Willys Tech:
Yes it will have a switch with it.

I know this was asked in the past but didnt see new, is there a way to run this on 6V?

you do not want to run a 12 volt electric motor on 6 volts. installing a resistor in a 6 volt system will drop voltage not step it up to 12 volts. you can replace the 12 volt motor with a 6 volt motor. just have to research the motor out. I would do it before you buy the kit.
Jack :
you can add a resistor available at auto supply shops to drop 12 to 6 volt. I did this on an old jeep wagon when i converted it to 12V and kept original 6V heater motor. Did same for radio.
Willys Tech:
Sorry these are for 12 volt only.

I have a 1954 willys pickup and need just a heater core where can I get one of these

Willys Tech:
You will have to try a salvage yard or have yours reconditioned locally for that.

Looking at this heater I noted it had a 12 volt fan motor. My '49 CJ3A is only a 6 volt system. Do you make a kit to convert a 6 volt to 12 volt system? Larger brake kits too? Thanks so much.

Willys Tech:
We do sell alternator conversion kits, coils, hi-torque starters ect. Please call us toll free and we can quote you out.

I have a 1950 CJ-3A with factory heat and need a 12 volt electrical motor to fit in the place of the 6 volt motor, Do you have such a critter? Thanks Shawn

Willys Tech:
This would be your best option. I dont believe that is something available.

Looking for replacement cable for heater, etc as well as dash parts for a 1968 cj5 and can't seem to find them on your site

Willys Tech:
The heater cables are a local item. Nobody reproduces those currently.

Have the 6volt heaters come out yet?

Willys Tech:
Sorry not yet.

Will this 12 Volt model fit into a 1952 Willy's M38 A1 that has been converted from 24v to 12v? The other heater you have listed for our model Willy's is 24 volt.

Willys Tech:
Yes these will work for your 12 volt system. We also sell 24 volt ones too!

I see two boxes in the photo? Where do they go? Does the large one go in the engine compartment where the old heater box is? Small one?

Willys Tech:
You can mount it about anywhere really. These will fit under the dash.

I have a 1964 jeep with 21,000 miles that i would like to do some work on. How do i tell exactly what model i have? Where can i find this info? Also it has a heater that is hooked up to the gas line near the carb. What type is this and are there parts available for it.---Thanks

Willys Tech:
If its a Jeep then it is a CJ-3B or CJ-5 if its a 1964. Please look on our website in the about Willys section and all our customer photos section and you should be able to ID it. You can also call us toll free. We are more than happy to help.

Hello, you ship to Argentina? I can pay via PayPal? thanks

Willys Tech:
Yes we ship daily UPS and USPS (post office) international.

looking for fresh air hose 4.5 dia. from radiator to heater for a 1958 willys jeep. also need 3 hose from heater to defroster

Willys Tech:
The part number is AIRDUCT4.5 on the hose. I do have some other hose sizes but not 3.

Am I correct in assuming the heater unit is two piece and one is mounted under the hood the other inside the vehicle? Also, will this work on a Jeepster?

Willys Tech:
Is is all one unit. It will work with Jeepster as well.

Do you have the wiring instructions for this part?

Willys Tech:
Yes, it comes with complete wiring instructions. We are working on posting them online now.

I have a heater that was made by Hunter Mfg. The following appears on an attached metal tag. stock no. 2540 00 869 0424 model no. HW 20 2 serial No. 92200 Volts 28 Amps 6.5 What do I have, something of worth,or just a boat anchor? thanks Bob

Willys Tech:
That is a aftermarket heater. If you like take a photo and email it to us. I can take a look at it too.

I am looking for the fan motar on the heater under the driver side dash for my 47 CJ2A. the heater core is still good but the fan is broken and i have converted my jeep to 12 volts any ideas? thanks!

Willys Tech:
You will have to match something locally up on that. This HEATER will do the trick for you too.

are the controls attached to the unit, or is the control wired to mount in dash ?

Willys Tech:
Typically people attach them to the dash.

I have a 1966CJ-5. Is the firewall available in the catalog good for the CJ-5?

Willys Tech:
We can probabaly get good used on the firewall.

do you ship to australia postcode 5373 do you accept credit card over the phone???

Willys Tech:
We do ship daily USPS and UPS international. You can always call us and we can help you over the phone too. Thanks!

would two heaters be too much heat!

Willys Tech:
One should be plenty :)

Is this heater electic or does it require water hose from the engine

Willys Tech:
It is hydronic.

Q:does this heater work off of the coolant system or does it work off of just electric?

Willys Tech:
It is hydronic so coolant.

The heater information states one ducted unit can heat driver and passenger and the other can be used as a defroster. Does it come with both? Or do you have to purchase a second unit?

Willys Tech:
You can route it either way.

Can you tell me if the front pulley on an L6-226 is a vibration damper or a harmonic balancer?Or is this covered in the shop manuel?Thank you.

Willys Tech:
It is a bit of both. Its covered in the shop manuals we sell as well.

Does the heater fit up under the dash out of sight. My 1942 MB has a glove box so it can't go up above the passengers feet like it could on a CJ2a that has not glove box. Just exactly where does it fit?

Willys Tech:
It is barely visible under the dash when mounted up high. You can really put it up just about anywhere center to passenger side.

Does it come with a heater control valve? It can be adaped to other vehicles?

Willys Tech:
If you want a separate on/off valve for summer you just have to line it in. It can be used on about anything.

Can the heater operate like a fan for the summer time?

Willys Tech:
Im sure it could.


Willys Tech:
Yes, it fits great under the dash and it is a simple heater hose connection.

I have an M38A1 with 24 volt system. Do you have this in 24 volt and what is the difference in price if any?

Willys Tech:
Yes, we have them. They are the same price. Please call me toll free: 888-648-4923.
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