98 XJ radiator Fan cycles often
#1
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Year: 1998
Model: Cherokee (XJ)
Engine: 4.0
98 XJ radiator Fan cycles often
My fan cycles often and loudly. sounds like the AC comes on but it is just the coolng fan.
#2
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Year: 1995
Model: Cherokee(XJ)
Engine: I6 4.0L
The fan is triggered by either the A/C(so a/c OR defrost) or the coolant temp.
Are you running the A/C or defrost when it does this, or are you overheating?
If you're running ac/def it may be running normally but have a dying fan that's getting louder so you're noticing it more. If you're overheating (about 220-ish) and that's causing the fan to cycle frequently then you need to fix that problem since fan cycling is the least of the worries.
Are you running the A/C or defrost when it does this, or are you overheating?
If you're running ac/def it may be running normally but have a dying fan that's getting louder so you're noticing it more. If you're overheating (about 220-ish) and that's causing the fan to cycle frequently then you need to fix that problem since fan cycling is the least of the worries.
#3
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Year: 1997
Model: Cherokee
Engine: 4.0L
Whats the temp gauge read when it turns on? I think it turns on at 217* or so, or when the a/c is running. And/or if the temp sender in the thermostat housing is unplugged.
#4
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Mine does that when the refrigerant is low in the AC system. It's actually the compressor kicking on, realizing pressure is low, then kicking back off. Since that is one of the two things that will turn on the fan, the fan will also turn on and off frequently.
The AC compressor runs in AC but also in Defrost mode, so you might not necessarily notice low refrigerant when running the defroster.
The AC compressor runs in AC but also in Defrost mode, so you might not necessarily notice low refrigerant when running the defroster.
#5
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Year: 1998
Model: Cherokee (XJ)
Engine: 4.0
It WAS in defrost mode. Also it does it in AC mode.
Is this an indication of impending problem?
It does not run hot and AC seems to work good.
Is this an indication of impending problem?
It does not run hot and AC seems to work good.
#6
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Year: 1995
Model: Cherokee(XJ)
Engine: I6 4.0L
If you're worried about it, have your A/C serviced - just to make sure the refrigerant/oil levels are good.
Otherwise I wouldn't worry about it. If the fan is loud just replace it. Like I said, I bet it's doing what it always has but you notice it more with the loud fan.
Otherwise I wouldn't worry about it. If the fan is loud just replace it. Like I said, I bet it's doing what it always has but you notice it more with the loud fan.
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#10
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Year: 1995
Model: Cherokee(XJ)
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Think of it this way - what is "A/C" - it's basically removing humidity from the air - which has the effect of cooling the air. What is defrost trying to do? - Remove fog from the inside and melt snow/ice from the outside - so it also needs to remove humidity. So defrost is just air conditioned air pointed at the windsheild.
We tend to use it with the warm air selected, but you could use it with cold air too.
We tend to use it with the warm air selected, but you could use it with cold air too.
#13
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Year: 1995
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Anytime! I'm always happy to share my limited knowledge.
It's funny, in my Corolla it's a push button A/C, so you set it on whatever, like high only, high/low, etc and push the button for A/C or no A/C, but if you have it on A/C and switch it to either of the defrost settings the little light on the A/C switch goes off (since defrost is always A/C on) - but it's counter-intuitive. It looks like you can't run A/C on the defrost settings when in truth you can't turn A/C off on the defrost settings.
It's funny, in my Corolla it's a push button A/C, so you set it on whatever, like high only, high/low, etc and push the button for A/C or no A/C, but if you have it on A/C and switch it to either of the defrost settings the little light on the A/C switch goes off (since defrost is always A/C on) - but it's counter-intuitive. It looks like you can't run A/C on the defrost settings when in truth you can't turn A/C off on the defrost settings.
#14
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Last edited by wizardpc; 03-20-2018 at 12:27 PM.
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