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Overheating -- Coolant spewing out of radiator cap when COLD
#1
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Model: Cherokee
Overheating -- Coolant spewing out of radiator cap when COLD
Any ideas what could be causing this?
It is overheating at idle. No coolant loss. When COLD with the radiator cap off, with the car started, coolant will overflow out of the radiator reservoir.
The car has sat for 4 years prior to this. Arizona summer temperature ambient of 100F today.
92 XJ 4.0
Replaced thermostat already.
Any help would be great. Kinda stuck here...
It is overheating at idle. No coolant loss. When COLD with the radiator cap off, with the car started, coolant will overflow out of the radiator reservoir.
The car has sat for 4 years prior to this. Arizona summer temperature ambient of 100F today.
92 XJ 4.0
Replaced thermostat already.
Any help would be great. Kinda stuck here...
Last edited by ps2cho; 09-04-2013 at 10:59 AM.
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#8
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Year: 1987
Engine: Check
Yes, it should never see anything above 210.
You SHOULD have both the res and a rad cap, both can shoot coolant out.
Sounds like it needs a water pump or radiator. More likely a radiator if it keeps cool on the freeway.
Wait...what fans do you have? Mechanical? They working? If mech, the clutch good?
You SHOULD have both the res and a rad cap, both can shoot coolant out.
Sounds like it needs a water pump or radiator. More likely a radiator if it keeps cool on the freeway.
Wait...what fans do you have? Mechanical? They working? If mech, the clutch good?
#9
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What I am saying is -- with the car cold, there should be no reason that coolant should be overflowing out of the reservoir RIGHT? I know when the coolant boils it will, but I am talking strictly cold it does it.
This is my brothers car, I will ask him about the fans. He says the clutch fan works, not sure about the electrical one...
I am assuming the 2nd fan (electrical) is given power both via condenser temperature/pressure AND coolant temperature, right? If so, what is the temperature that it should turn on at?
This is my brothers car, I will ask him about the fans. He says the clutch fan works, not sure about the electrical one...
I am assuming the 2nd fan (electrical) is given power both via condenser temperature/pressure AND coolant temperature, right? If so, what is the temperature that it should turn on at?
#12
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Year: 1997
Model: Cherokee
Engine: 4.0L
Sounds to me like a blown head gasket or a cracked head. Exhaust gases are probably somehow getting into a coolant passage and causing pressure to build up in the cooling system.
So why was it parked 4 years ago? Engine problems maybe?
So why was it parked 4 years ago? Engine problems maybe?
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Year: 2015, 2012
Model: Grand Cherokee (WK2)
Engine: 3.6L
The only way a cold cooling system gets pressurized is exactly what you have described as causes.
Isn't it funny how everyone blames the lowly thermostat first and changes it--to no avail?