Questions about the engine cooling system?
General Cooling System Info
There are 2 types of Cooling systems on the XJ/MJ
- Open style - any normal cooling system used today.
- Closed style - no radiator cap and utilizes a pressure bottle. used in 87-90 XJs.
MAINTENANCE SCHEDULE
- Change engine coolant every 12,500 miles or 12 months.
- Thereafter change engine coolant at the beginning of every winter season.
- Maintain ethylene glycol and water solution at a mixture of 50/50.
Cooling System Specs
Application |
Thermostat
Temp F (C)
|
Rad. Cap
PSI
|
Coolant Capacity
Quarts (L)
|
2.5L |
192-198 (89-92) |
12-15 |
10 (9.4) |
4.0L |
192-198 (89-92) |
12-15 |
12 (11.3) |
4.2L |
192-198 (89-92) |
12-15 |
10.5 (9.9) |
6.0L |
192-198 (89-92) |
12-15 |
14 (13.2)
(1) - Without A/C 23 qts. (2.1L) for recovery tank.
(2) - Includes 1 qt. (.9L) for recovery tank.
|
Coolant Temperature Sensors
- the 99 XJ has only 1 coolant temp sensor which is located on the Thermostat Housing
Cooling System Upgrades and Tech Write-ups