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
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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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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. |
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. |
Originally Posted by dave1123
(Post 3491446)
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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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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engine temperature
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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engine temperature
I forgot to say the faster I go to the hotter it gets it don't make no sense
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Originally Posted by Skull34
(Post 3491728)
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
Originally Posted by Skull34
(Post 3491730)
I forgot to say the faster I go to the hotter it gets it don't make no sense
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I agree ^^ if the RAD is the only thing you havent swapped, just do it. I spent an extra $40 over the OEM quality and got a 3 row welded end-tank aluminum RAD and havent even hit 210F yet.(AMAZON-like 2 years ago.)
As a short term helper(NOT A REMEDY) you could get some Water Wetter from the parts store. It is pretty good about lowering the coolant temps 10-20degree. But I would never call this a fix, It's a chemical change that has nothing to do with your existing cooling issues. |
Did you burp it correctly using the screw on the top of the rad?
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https://cimg7.ibsrv.net/gimg/www.che...9af3fd1650.jpg
https://cimg1.ibsrv.net/gimg/www.che...4e3bb9a800.jpg https://cimg3.ibsrv.net/gimg/www.che...cb2dad9487.jpg https://cimg8.ibsrv.net/gimg/www.che...6215501397.jpg Didn't see any of this till I started striping it out. The air conditioning condenser in the front and the fan and fan shroud in the back hid it pretty well...I think my first gander at my problem was when I took the body metal off the top of the radiator. |
Originally Posted by JimmyBo1313
(Post 3492849)
Didn't see any of this till I started striping it out. The air conditioning condenser in the front and the fan and fan shroud in the back hid it pretty well...I think my first gander at my problem was when I took the body metal off the top of the radiator. |
That's not just a blocked rad, that dust IS the rad! Look close and you might find a glimmer of my tactical flash light trying to come through.
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