1999 5.9 4x4 D Not getting to Operating Temperature? - DodgeTalk : Dodge Car Forums, Dodge Truck Forums and Ram Forums
 
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#1 Old 10-23-2007, 01:57 PM
chriscorliss
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1999 5.9 4x4 D Not getting to Operating Temperature?

Gentlemen,
If you could help me out I would greatly appreciate it. I read all 926 threads and learned a lot, but I am still unable to diagnose why my
1999 4x4 5.9L D of 89,000 miles will not get to operating temperature. It began doing this about 6 months ago, I replaced the thermostat with a 195, and it continues to run cold. IT WILL GET TO OPERATING TEMP with the A/C on, so I know the gauge is good, but the needle barely enters the "white brackets" on the temp gauge with the A/C off. And the engine fan turns freely when I move it. Any ideas?
I have been losing oil and coolant with no puddles on the ground. From this forum I understand I am losing oil because the intank manifold gasket is failing and losing coolant due to evaporation since I live in Arizona and the reservoir is not pressurized. Do you guys concur?
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#2 Old 10-23-2007, 02:58 PM
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is this at idle, or will it barley warm up when you drive it around? Mine seems to take a while to warm up idling, I have to drive a little for it to warm up. But the less heat your engine has, the better. Why worry about it? I could understand it's it's not warming up to the point where it runs smooth, but if it runs smooth, why worry about it?

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#3 Old 10-23-2007, 06:16 PM
chriscorliss
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Both. It doesn't get to Operating Temp in either Idle or after driving around unless I have the A/C on. I guess the only draw back is that I don't have any heat when I need it--it only comes out luke warm. So you are saying that there are no negative side-effects to having the engine run cold all the time?
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#4 Old 10-23-2007, 06:29 PM
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for the money put another thermostat in...... test drive with scan tool to verify proper operating temp......190 to 205 ish.

2000 dodge durango,5.9 L,4wd,cold air intake,clear corners,mechanic from canada(spend my days diagnosing and finding broken wires/bad modules),onboard laptop loaded with mitchell, alldata,autoenginuity among others
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#5 Old 10-23-2007, 07:36 PM
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Sounds like a stuck thermostat to me as well.
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#6 Old 10-24-2007, 06:48 PM
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Chris, I currently have the same problem with my 99 5.9. surprising since you live in AZ. I live in IL so need to address this problem immediately. I have a few ideas and will let you know what i come up with. keep us posted. thanks
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#7 Old 10-24-2007, 07:16 PM
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Uh OH

Chris, I Meant i have the operating Temp problem, not the others, From what you describe you should see if under the RAD cap you see a milkshake like foam-funk goin on. sure sign of a head - manifold gasket problem. funny thing is your oil level should go up. otherwise it's dumping in a cylinder or two and being burned up. check your plugs for fouling. or get a compression test.
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