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Flex-a-lite 640 Mojave Heater

4.7 out of 5 stars 27 customer reviews
| 9 answered questions

List Price: $229.95
Price: $212.31 & FREE Shipping
You Save: $17.64 (8%)
In stock.
Usually ships within 2 to 3 days.
Ships from and sold by 4Wheel Online in easy-to-open packaging.
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  • Overall dimensions of 10 1/8" x 5"
  • Fan moves air at 140 cubic feet per minute at 12,000 BTU
  • 3-speed quiet operation blower
  • One year manufacturer warranty
  • One year manufacturer warranty
54 new from $212.31 2 used from $235.22
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$212.31 & FREE Shipping In stock. Usually ships within 2 to 3 days. Ships from and sold by 4Wheel Online in easy-to-open packaging.

Frequently Bought Together

  • Flex-a-lite 640 Mojave Heater
  • +
  • Flex-a-lite 650 Mojave Plenum Heater
  • +
  • Flex-a-lite 662 Mojave Installation Kit
Total price: $383.78
Buy the selected items together


Product Information

Technical Details

Brand Flex-a-lite
Model 640
Item Weight 5.9 pounds
Product Dimensions 10.5 x 5 x 9 inches
Item model number 640
Manufacturer Part Number 640
OEM Part Number 640

Additional Information

ASIN B000CNJBPU
Customer Reviews
4.7 out of 5 stars 27 customer reviews

4.7 out of 5 stars
Best Sellers Rank #367,217 in Automotive (See top 100)
#21 in Automotive > Replacement Parts > Engine Cooling & Climate Control > Heating > Heaters
#194 in Automotive > Performance Parts & Accessories > Climate Control System
#6,321 in Automotive > Replacement Parts > Engine Cooling & Climate Control > Air Conditioning
Shipping Weight 5.9 pounds (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item is not eligible for international shipping. Learn More
Date First Available December 2, 2005

Warranty & Support

Warranty, Parts:PartsWarranty, Labor:Full Manufacturer's Warranty - Sold by Authorized Reseller
Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Product Description

The Flex-a-lite Mojave heater is designed to simplify the task of providing heat and comfort to your ride. It eliminates the need to locate hard-to-find parts, or go through expensive rebuilds to get old units in working order. The Mojave gets its heat from the hot water in your vehicle's cooling system (just like an O.E. unit), but has the advantage of fitting into a wide variety of confined spaces. Its compact size, ease of installation and operation make it the ideal replacement unit.

Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Verified Purchase
I bought this to heat the cab of my tractor. Many of the tractor specific options were very expensive, $400 and up! This one works great and puts out plenty of heat. It is a bit on the loud side for a car, but in my tractor cab it isn't an issue at all, EVERYTHING else is louder.
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Verified Purchase
Would have given it a higher review if I didn't have to fix it first. Flex a lite put the motor fan assembly in upside down, reversing the blower. Works great....now.
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Verified Purchase
This is the same unit the dealer would install for a large fee the install was easy and putting a tee into the cooling system is easy also but I suggest using y's as using t's do not produce good flow at low speed. Do not use plastic fittings they will leak i will try and find a link to metal ones and post it here.
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Verified Purchase
I like it. It "only" costs $200 and provides a big amount of heat. My Taurus (wagon) core heater failed so i need it for the Canadian winter. The only bad thing ... it's very big. I found no place to put it in the car but at feet level (heat goes up, besides that i had no other option). So now i have to turn it off after 5-10 minutes (when car is hot) because it's way too hot. I keep it on speed 2 almost always and like i said it works when it's -20 outside.

Something important is that, if used like in my case when the car's heater is dead, the extra pack (with cables for directing heat through a pipe is very important to be able to provide a way to heat the windshield (defrosting)). Sure it's not a humidity remover like the car's standard one but it will Work. But then you need even more space and spend $60 more. Anyway it's way below the standard $800 a new heater costs for these old cars.

In our case, we had no option so we bought it an we don't regret it. We have to use what we can afford, everybody would love heat coming from the cars ventilation system but that's impossible in this case. This would be great for a big truck or a tractor.

Too bad that we will replace soon the car for a new one so i will have a used heater for sale :)
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Verified Purchase
I purchased this heater last year before taking my Poison Spyder Bruiser to Moab, Utah. It was good timing for the heater, the first day it snowed 6 inches on our party. Installation was a breeze. The three (3) speed fan switch works well for regulating heat. I installed a ball valve inline with the water supply so I can turn it off in the summer. Delivers plenty of air flow for any jeep with a rag top. Comes with instructions for an easy electrical hookup. High quality construction. This heater would be a good addition for the rear seat passengers.

I HIGHLY RECOMMEND THIS HEATER FOR ANY VEHICLE THAT NEEDS SOME HOT AIR.
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Verified Purchase
Item produces sufficient heat as promised by company. 3 speed fan is NOT quiet on Med/High settings. The Install was more difficult than expected from company descriptions and user comments. Fitting for heater hoses required larger and smaller brass couplers than sizes stated on product. Am I satisfied with this purchase? Yes. I would say the install requires more work and know-how than Mfr suggested - directly or indirectly - through customer comments. This will vary with age/size/model of your vehicle.
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I purchased this heater in order to provide additional cooling for my small block V-8 (addition of coolant to the system, as well as additional heat transfer) and the added benefit of providing heat to the passengers in the back of my FJ40 off road Toy. The unit was too large to mount in the back, but since I purchased the plenum box, I was able to mount it between the bucket seats and aim the 2 1/2" duct to the rear. This has worked out well. My first outing included many hours of steep hill climbing that would normally stress the coolant system, but I was able to crank the rear heat on high (noisy, but drowned out by the V-8) and keep the temp. down to 200 - 210. The unit seams very sturdy and I feel it was a good value.
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Verified Purchase
Awesome little heater, this heater can make you sweat. I was surprised at how much heat it puts out. So far I have used this heater for years now and it has not failed me yet.So if you have little space for a heater and need big heat you cant go wrong with this Mojave Heater. Buy with confidence.
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