The Chinese word for radiator is
散热器

sàn rè qì

Chinese Definition

radiator
1. 辐射体
2. 发光物
3. 放热体
4. 放热器
5. 暖气机
6. 冷却器
7. 冷却装置
8. 播送用天线
9. 电热器
Components
散
1. free and unfettered
2. natural and restrained; at ease
3. loose; free
4. to become loose; to break apart; to fall apart
5. scattered; fragmentary; odd; apart
6. mixed and disorderly; miscellaneous
7. (literature) free from parallelism
8. careless; incautious; inattentive
9. ordinary; useless
10. (TCM) medicine in powder form
11. to break up; to disperse; to scatter
12. to distribute; to disseminate
13. to open; to open wide
14. to dissipate; to distract; to find diversion
15. to run away; to escape; to flee
16. to express; to declare; to explain
17. to end; to finish; to be over
18. to lose; to miss
19. to herd; to graze; to walk (animals)
20. chaotic; helter-skelter
21. (Hokkien) to induce sweat
22. (Mainland China Hokkien) courageous; fearless
23. (Xiamen, , Quanzhou, &, Philippines Hokkien) to stroll; to saunter; to go for a walk
24. (Zhangzhou, &, Taiwanese Hokkien) poor
热
1. Simplified form of 熱
器
1. device; tool; utensil; ware
器具 - utensil
2. (medicine, biology) organ
器官 - organ
3. capacity; tolerance
器量 - tolerance
4. talent; ability
大器晚成 - idiom A great talent takes time to mature.
器重 - to regard highly

散熱器
1. n. radiator (device that lowers engine coolant temperature by conducting heat to the air)
2. n. cooling panel, heat sink
3. n. fan (computer)