Baywindow Bus Alternator Cooling Pipe - 1975-79 - Type 4 Engines

This alternator cooling pipe is a high-quality reproduction rubber elbow designed for Volkswagen Type 4 aircooled engines fitted with 70 amp alternators. It replaces the original factory duct that channels cooling air directly to the alternator, a critical component for preventing overheating and ensuring reliable charging performance.

Originally fitted rubber elbows were often made from poor-quality material and are now commonly found hard, brittle, cracked, or missing altogether. This improved reproduction restores proper airflow and peace of mind.

What this part does

The cooling pipe supplies fresh air to the alternator, helping to regulate its operating temperature. On aircooled engines, alternators rely on directed airflow to dissipate heat generated under load. Without this duct, alternators can overheat, leading to reduced output, bearing failure, or premature alternator damage.

How it works

The rubber elbow fits between the alternator and the bodywork, forming a sealed air path that feeds cool air into the alternator’s internal fan. By maintaining this airflow, the alternator remains within safe temperature limits even during long drives or high electrical demand.

Key features

• Correct round outlet design for 70 amp alternators

• Flexible, heat-resistant rubber construction

• Prevents alternator overheating

• Direct replacement for hardened or cracked originals

• Essential for maintaining correct cooling on Type 4 engines

Engine compatibility

• Type 4 aircooled engines:

  • 1700cc

  • 1800cc

  • 2000cc

• Alternator: 70 amp only

Vehicle applications

• VW Baywindow Bus (T2): 1972–1979

• VW Type 25 / T3 (Aircooled): 1980–1983

• VW 912E: 1976

(For Baywindow Buses built after August 1974 with factory 70 amp alternators.)

Fitting notes

• Fits between alternator and bodywork

• Recommended replacement whenever the alternator is removed

• Check alternator seal and surrounding engine bay seals for best cooling results

This alternator cooling pipe is a small but vital component in keeping your Type 4 aircooled engine running cool and reliable—especially important on vehicles that see regular use.