There are 6 radiators in the game. They are progressively more expensive as their quality increases. New radiators can be purchased at the junk shop. The radiator of your ship defines the the amount of damage you receive from drilling into magma deposits.

Code - Effect

Dual Fan (10% Effective - Buy for $2,000
Dual Turbine (40% Effective) - Buy for $20,000
Puron Cooling Fan (60% Effective) - Buy for $100,000
Single Turbine (25% Effective) - Buy for $5,000
Stock Fan (<10% Effective) - Start a new game
Tri-Turbine Freon Array (80% Effective) - Buy for $500,000