How to tell if your XJ fan is overheating?
Check the fan belt for slipping, glazing and improper tension. Check the condition of all the hoses – they should not be brittle, swollen or extremely soft and should not exhibit rot, rust or scaling inside. If they are over 5-6 years old then they are probably due for replacement as normal preventative maintenance.
Can a 4.0L XJ run without a thermostat?
Maintain at least a minimum of 44% ethylene glycol and don’t EVER run straight water (except in emergencies). Do not run without a thermostat or the engine will begin to form sludge from condensation in the crankcase which will cause long term engine damage (condensation is water and not the best thing for lubricating bearings).
Why is my Jeep Cherokee overheating so much?
If your radiator overflow is full (and you radiator fan is kicking on), it is very likely that a bad thermostat or bad water pump are causing your Cherokee to overheat. Of these two, the thermostat fails more often than the water pump. It’s also much more affordable and easier to get to.
How often should I Flush my XJ air conditioner?
The cheaper solution is to flush it every year which should be adequate in these cases although components will have shorter life spans. Normally, the system should be flushed every 3-4 years. Make sure you use quality coolant with anti-corrosives and rust inhibitors along with distilled water (do NOT use tap water).
Check the fan belt for slipping, glazing and improper tension. Check the condition of all the hoses – they should not be brittle, swollen or extremely soft and should not exhibit rot, rust or scaling inside. If they are over 5-6 years old then they are probably due for replacement as normal preventative maintenance.
Where is the thermostat on a jeep XJS?
The problem with running hot in XJs is two fold. First, marginal cooling system to start with. Second, the temp sensor for the gauge is at the back of the engine in the head, the hottest place in the engine cooling system. It might be 220° there, but only 195 at the stat.
Maintain at least a minimum of 44% ethylene glycol and don’t EVER run straight water (except in emergencies). Do not run without a thermostat or the engine will begin to form sludge from condensation in the crankcase which will cause long term engine damage (condensation is water and not the best thing for lubricating bearings).
If your radiator overflow is full (and you radiator fan is kicking on), it is very likely that a bad thermostat or bad water pump are causing your Cherokee to overheat. Of these two, the thermostat fails more often than the water pump. It’s also much more affordable and easier to get to.