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engine temperature

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Old 05-17-2018, 04:42 PM   #1  
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Default engine temperature

99 Jeep Grand Cherokee Laredo 4.7 it runs at 222 to 230 I replaced water pump thermostat radiator cap flushed motor and flushed radiator and new clutch fan is that a normal running temperature

Last edited by Skull34; 05-17-2018 at 06:03 PM. Reason: Forgot to put in that I bought a new clutch fan too
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Old 05-18-2018, 12:08 AM   #2  
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That's too warm. My 4.7 never goes over 210. I would test the temperature using a infrared thermometer. The gauge could be off.
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Old 05-18-2018, 04:18 AM   #3  
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A good way to read engine temp is with a scan tool that has real time data, find them on ebay for under 50.
That will tell you the temp that the engine management system is seeing, via the coolant temperature sensor.
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Old 05-22-2018, 10:26 AM   #4  
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On 99 and newer jeeps, the temp sensor sends data to the PCM which interprets it and sends a signal to the gauge for the readout. The sensor is NOT hooked directly to the gauge. Therefore a scan tool should agree with the gauge. Or should.

What I found amusing was with the engine at operating temp of 210* the IAT was showing 158* at idle with an outside air temp of 65*. Not exactly cool, if you know what I mean. I hope it's cooler at highway speed.

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Old Yesterday, 11:16 AM   #5  
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Originally Posted by dave1123 View Post
What I found amusing was with the engine at operating temp of 210* the IAT was showing 158* at idle with an outside air temp of 65*. Not exactly cool, if you know what I mean. I hope it's cooler at highway speed.
Heat soak is a fickle *****! Heat wrap the intake and exhaust components to lessen the soak. You can also vent the hood to promote more air flow higher speeds, but generally the manufacturers do a pretty good job of designing them properly.
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Old Yesterday, 11:20 AM   #6  
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As others had said, there are many different ways to diagnose, and the first step is to verify your factory gauge is accurate with a know good gauge. Cheapest way would be to hack a cheap radiator hose in half, add an inline ANALOG temp gauge, and compare. With the gauge on the dash being PCM controlled there are many things that could cause a bad reading/signal to the gauge. Could be a bad Earth Ground under the dash, at the firewall, or the frame(unibody). Also could be corroded wires, and with corrosion the electrical resistance rises and could cause all sorts of odd signals. Good luck.
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Old Yesterday, 01:44 PM   #7  
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So far I've replaced everything but the radiator right now I'm running radiator cleaner through it for about 3 hours now and still running at 240 on the highway when I'm sitting at an idle the temperature starts dropping I just can't figure it out my radiator is clear I can see right through it there's no obstruction the temperature is 80 degrees today so it is running hot never tried it with the air conditioning on yet I think it would completely overheat
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Old Yesterday, 01:47 PM   #8  
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I forgot to say the faster I go to the hotter it gets it don't make no sense
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