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#1 Old 03-31-2008, 09:17 AM
BigWhiteD
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Bad Thermostat?

So over the last couple of days my water temp gauge has been going a little crazy. The gauge will show an increase in water temp and then it will plunge back down to normal. It continues to do this now all the time. The coolant level is fine, the fan is working, and no water leaking on to the ground.

Thinking about giving the thermostat a change and seeing if that fixes things.

Let me know what you think!

Thanks,

Dan

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#2 Old 03-31-2008, 08:43 PM
Don Fox
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BWD:

Those signs surely could indicate a T stat past its prime. If yours is OEM at 93k, I would change it just to eliminate the possibility. While you are at it, if your cooling system has not been flushed in the last 30-35k, I would do that also and put in fresh anti freeze.

Don

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#3 Old 04-02-2008, 12:15 AM
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Hi, I had a similar problem myself. Bought a new thermostat and coolant. Before I could get around to doing the change I noticed a large temp drop and my heater was still plenty warm. So I got a new sending unit and that cured it. Lot easier job. Although I have the 4.7 myself I'm pretty sure it could be the same on yours. I will say that mine seemed to indicate a cooler temp than actual I do believe that is what affected my gas mileage until it was fixed since it sends info to the computer. If yours is showing a temp increase that could actually be the stat sticking. you definately don't want that.

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#4 Old 04-03-2008, 08:10 PM
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ya, its is most likely the thermostat,i was having the same problem, the temp would show it going up but they engine was still running fine and after a couple of seconds it went right back down, i just replaced my last week
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#5 Old 04-04-2008, 04:44 PM
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I would change the temp sensor first. A lot easier to do than t-stat..

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#6 Old 04-10-2008, 09:47 PM
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i'd plug my laptop in and go for a drive...............monitoring engine coolant temp.....probably graph it as well...........i'd look for it to climb to 203-207( i'm running a 205 thermostat way up here in canada) then i would notice it drop quite quickly down to 165-170 then slowly start to rise again..........up to 205 , drop to 175-180......that's a normal cycle for this time of year..............in the summer, it'll tend to stay closer to or above therm temp......

if you're getting really erratic numbers look for either no coolant on the sensor(a leak somewhere) or start looking electrically( sender, connections, wires,etc)

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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#7 Old 04-17-2008, 01:21 PM
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Well we were right...it was the thermostat.........the water pump, all the hoses, and the radiator cap! Now it runs great and stays nice and cool. I put a 180 degree stat in.

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  • 15x8 Rock Crawler 97 Series
  • Smitybilt Black Nerf Bars (Weby Special Edition)
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#8 Old 04-17-2008, 06:50 PM
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Temperature sensor is much less likely to fail though. It's likely sticking closed. If it were stuck open, you would have your engine go to normal operating temperature and then plummet while in motion.

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