Slight overheating
01-09-2012, 06:24 PM
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Year: 1987
Model: Cherokee
Engine: 4.0 6cyl
Slight overheating
87 XJ 4.0
So I replaced the plastic coolant tank cause it was spitting coolant. Now when it gets warmed up it starts to overheat. I have the idiot light no gauges and the light doesn't come fully on it barley lights up
I'm thinking the thermostat. Or water pump. How can I tell if the water pump is going out. Or should I just replace it for good measure.
So I replaced the plastic coolant tank cause it was spitting coolant. Now when it gets warmed up it starts to overheat. I have the idiot light no gauges and the light doesn't come fully on it barley lights up
I'm thinking the thermostat. Or water pump. How can I tell if the water pump is going out. Or should I just replace it for good measure.
01-09-2012, 06:35 PM
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Year: 1998
Model: Cherokee
Engine: 4.0L HO
Read your sig......+/-$250 replaces all cooling system components with new parts.....including a new rad. U'll sleep better.
01-09-2012, 06:42 PM
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Year: 1987
Model: Cherokee
Engine: 4.0 6cyl
I've heard you can convert it to an open system. How would I do that. Is there a write up for it. I searched for one but couldn't find any
01-09-2012, 07:07 PM
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Year: 1998
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Unless u have a good understanding of a "open system", all new replacement parts for your old "closed system" will probably give u the best bang for your buck.
01-09-2012, 07:10 PM
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Year: 1990
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01-09-2012, 07:23 PM
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Year: 1987
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So is there a write up for converting the system?
I'm thinking i might just replace the water pump. Rad. Fan clutch. And the hoses.
I'm thinking i might just replace the water pump. Rad. Fan clutch. And the hoses.
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01-09-2012, 07:41 PM
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01-10-2012, 06:22 PM
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Year: 1987
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I replaced the t-stat. Flushed the heater core and filled the rad through the top heater hose.
Drove to work and so far no overheating. I'll keep my eye on it.
When I can afford to I'm going to convert it.
So tell me of I'm on the right path.
I'm going to get a rad that has a cap. Hook up new upper and lower hoses. Take off the hoses that T off between the pressure tank and the heater core and just run hoses from the t-stat housing to the heater core.
Should that be it. It doesn't look like my XJ has a heater control valve.
Drove to work and so far no overheating. I'll keep my eye on it.
When I can afford to I'm going to convert it.
So tell me of I'm on the right path.
I'm going to get a rad that has a cap. Hook up new upper and lower hoses. Take off the hoses that T off between the pressure tank and the heater core and just run hoses from the t-stat housing to the heater core.
Should that be it. It doesn't look like my XJ has a heater control valve.
01-10-2012, 06:40 PM
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I replaced the t-stat. Flushed the heater core and filled the rad through the top heater hose.
Drove to work and so far no overheating. I'll keep my eye on it.
When I can afford to I'm going to convert it.
So tell me of I'm on the right path.
I'm going to get a rad that has a cap. Hook up new upper and lower hoses. Take off the hoses that T off between the pressure tank and the heater core and just run hoses from the t-stat housing to the heater core.
Should that be it. It doesn't look like my XJ has a heater control valve.
Drove to work and so far no overheating. I'll keep my eye on it.
When I can afford to I'm going to convert it.
So tell me of I'm on the right path.
I'm going to get a rad that has a cap. Hook up new upper and lower hoses. Take off the hoses that T off between the pressure tank and the heater core and just run hoses from the t-stat housing to the heater core.
Should that be it. It doesn't look like my XJ has a heater control valve.
Maybe previous owner did away with it thats not such a bad thing. You pretty much got the gist of the open system.
01-10-2012, 07:19 PM
#12
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Year: 1987
Model: Cherokee
Engine: 4.0 6cyl
If it does have a heater control valve I'm not seeing it. Where would it hook up. I know there's supposed to be a vacuum line to it.