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FrostHeater makes custom-fit coolant heaters for Volkswagen TDIs. This model is made specifically to fit the A4 chassis, MkIV Jetta & Golf, model year 2001-2003 with engine code ALH. Manual or automatic. Not for 1999.5, 2000 or 2004+ models. The difference between A4 models has to do with the battery cover design. Late A4 models use a one-piece cover where the sides and top of the battery are covered by one solid piece. This heater the one-piece design.

The FrostHeater connects to the vehicle's coolant system, heating the coolant and the engine block. Pre-warmed engines start faster and give cabin heat much more quickly.

Plug in the FrostHeater a few hours before you leave for a better start and quicker heat. Plug in for 4 hours and enjoy a fully warmed engine and instant heat in the cabin. Even better, use a heavy duty timer that turns on the FrostHeater for you.

Installation instructions included.


  Select Vehicle to Check Fitment
11 Unit(s) in Stock
  Name Price Select
Plug Cover Plug Cover $4.99
G13 Coolant 1 Gallon G13 Coolant 1 Gallon $19.95
  • Golf TDI MkIV (A4 chassis) w/ ALH Engine (2001-2003)
  • Jetta TDI MkIV (A4 chassis) w/ ALH Engine (2001-2003)
  • Jetta Wagon TDI (A4 chassis) w/ ALH Engine (2002-2003)
Buy any FrostHeater along with a gallon of Rowe G13 coolant and get $5 off!

For almost 17 years FrostHeater has been designing, developing, and producing Custom Engine Heaters for Volkswagens. With expertise in TDI engines, FrostHeater has established an outstanding reputation for high quality products and top-notch service. With 27 Custom kits covering 1977 to 2015 diesels, FrostHeater has thousands and thousands of satisfied customers throughout North America.

Straight forward installation and very effective. Coolant is fully warmed up before starting. ...


Frequently Asked Questions

All FrostHeaters use 1000w heating units.
No, this model is not for the Beetle. There are specific models for New Beetle TDI applications. Put your Beetle in the vehicle selector at the top of the page and search for Frostheater to see the New Beetle models.
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