Engine Temperature
#1
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Year: 1999 & 2000
Model: Cherokee
Engine: 4.0
Engine Temperature
1999 XJ Sport
Noticed the other day that the engine temperature was running slightly lower than the normal ~210.
Change out thermostat for a new Stant 195 (drilled bleed hole) and now the temperature is running even cooler than before?
Any thoughts on what to look at next?
#2
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Year: 1995
Model: Cherokee
Engine: 2.5L
I recently installed an in-line digital coolant temp sensor in my 95 so for the first time in 10 years of ownership I'm seeing what the temperature reads as I drive - and it's quite variable. Typical driving around town in 50-55* weather results in temperatures between 185* and 202*. I assume the variation is due to the thermostat engaging (195*), as well as the amount of air moving through the radiator. But I'm not seeing 210*.
I'm assuming it's cool in Indiana nowadays, so it could be an artifact of cooler ambient temperature coupled with a more efficient cooling system (new t-stat). I'm also not sure what the lines represent as far as actual temperature readings on that particular gauge.
I'm assuming it's cool in Indiana nowadays, so it could be an artifact of cooler ambient temperature coupled with a more efficient cooling system (new t-stat). I'm also not sure what the lines represent as far as actual temperature readings on that particular gauge.
#3
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Year: 1998
Model: Cherokee
Engine: 4.0L HO
1999 XJ Sport
Noticed the other day that the engine temperature was running slightly lower than the normal ~210.
Change out thermostat for a new Stant 195 (drilled bleed hole) and now the temperature is running even cooler than before?
Any thoughts on what to look at next?
Noticed the other day that the engine temperature was running slightly lower than the normal ~210.
Change out thermostat for a new Stant 195 (drilled bleed hole) and now the temperature is running even cooler than before?
Any thoughts on what to look at next?
Last edited by djb383; 11-25-2014 at 11:22 AM.
#7
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Year: 1999 & 2000
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Engine: 4.0
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#8
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The hole on your stat is fine, the OEM came with it, dont worry about it. Dont worry too much about your lower than normal temp either, the gauge reading you could verify with temp gun (or OBD2 scanner with live data, which is what I did and although it showed the gauge being a noth under 100C (midline, whoch would be your 210), the scanner reading live data showed 94C). So, your reading, if true, is still within normal operating temps.
I doubt that the hole with have any significant influence on warm-up temps, but djb and myself have been known tosometimes have different views on cooling system components
But cooler weather, somewhat cooler temps, not abnormal.
I doubt that the hole with have any significant influence on warm-up temps, but djb and myself have been known tosometimes have different views on cooling system components
But cooler weather, somewhat cooler temps, not abnormal.
#9
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Year: 1998
Model: Cherokee
Engine: 4.0L HO
The hole on your stat is fine, the OEM came with it, dont worry about it. Dont worry too much about your lower than normal temp either, the gauge reading you could verify with temp gun (or OBD2 scanner with live data, which is what I did and although it showed the gauge being a noth under 100C (midline, whoch would be your 210), the scanner reading live data showed 94C). So, your reading, if true, is still within normal operating temps.
I doubt that the hole with have any significant influence on warm-up temps, but djb and myself have been known tosometimes have different views on cooling system components
But cooler weather, somewhat cooler temps, not abnormal.
I doubt that the hole with have any significant influence on warm-up temps, but djb and myself have been known tosometimes have different views on cooling system components
But cooler weather, somewhat cooler temps, not abnormal.
#10
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On a total capacity of over 11 liters of coolant, the ' bleeding' from the hole which at some point will occur, is negligible. Air bleeding prior to that is more the purpose of it.
Thermostat will start to open not long after, which will be letting significantly more coolant pass then that little hole. I think the OP should just not be concerned about all this, thats all.
#12
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Year: 2004
Model: Grand Cherokee
Engine: 2000 4.0
I think we're turning cents here.
On a total capacity of over 11 liters of coolant, the ' bleeding' from the hole which at some point will occur, is negligible. Air bleeding prior to that is more the purpose of it.
Thermostat will start to open not long after, which will be letting significantly more coolant pass then that little hole. I think the OP should just not be concerned about all this, thats all.
On a total capacity of over 11 liters of coolant, the ' bleeding' from the hole which at some point will occur, is negligible. Air bleeding prior to that is more the purpose of it.
Thermostat will start to open not long after, which will be letting significantly more coolant pass then that little hole. I think the OP should just not be concerned about all this, thats all.
#13
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Year: 1998
Model: Cherokee
Engine: 4.0L HO
The point is, with the "bleed" hole drilled in the stat (which is unnecessary), some coolant flows thru the radiator, cooling a cold motor even though the stat is closed, thus slowing motor warm-up compared to when there is no flow thru the rad. The OEM stat "bleed" hole is fully closed when the motor is cold thus making for quicker motor warm-up. The OEM "bleed" hole opens only when the motor is off.
#14
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djb, that calculated amount seeping through the hole, causing "flow" through the radiator....to delay engine warm-up....sorry...I'm probably missing something here, but really, I think I'll move on...
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Year: 1998
Model: Cherokee
Engine: 4.0L HO
The motor takes longer to warm-up when coolant is flowing thru the rad than when coolant is not flowing thru the rad.........it's that simple, really. I'm sure there is a mathematical formula that will verify that as well.