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post #1 of 20 (permalink) Old 04-28-2012, 02:23 PM Thread Starter
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Temperature gauge going up and down

hi,

I bought commander 2006 5.7 hemi around 2 months back. As it was winters 2 months back I never had this problem of temp gauge. From last 2 weeks as temp of the city is rising, temp gauge of my commander suddenly goes up and when the car starts moving it comes down after few minutes. I went to the dealer and mechanic there told me its very normal and all HEMIs are like this the gauge goes up and down its not to worry.
I want to ask you guys if the same happens to you, if the car is not moving the gauge reaches very near to H ... only when the vehicle starts moving it comes down.
Secondly when the gauge starts rising the fan starts which creates alot of noise, fan will stop only when the gauge will drop and then the sound becomes normal.
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post #2 of 20 (permalink) Old 04-28-2012, 02:47 PM
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Welcome to the forum. I haven't had this happen with my HEMI. I'm sure others will chime in. Join the forum's HEMI Commanders group here---> https://www.jeepcommander.com/forums/group.php?groupid=24

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post #3 of 20 (permalink) Old 04-28-2012, 10:00 PM
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The fan on the hemi is really loud it's shuts off when the engine drops below a certain temp about 215 I think. I don't think that's normal and leads me to believe your low an fluid or most likely the pump might be failing. What rpm is your jeep ideling at?


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post #4 of 20 (permalink) Old 04-28-2012, 10:24 PM
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I cry BS to the dealer's diagnosis!!!

My hemi never behaved that way. I can't even say the fan is any louder than any other vehicle I've owned. ...and I just topped 102k mi today.

Perhaps your thermostat is sticking or the fan isn't turning on at the correct time.

Good luck, and keep us informed.


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post #5 of 20 (permalink) Old 04-30-2012, 09:14 PM
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it sounds to me like you have an air pocket in the cooling system
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post #6 of 20 (permalink) Old 04-30-2012, 10:29 PM
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The hemi fan is LOUD LOL on the trail I always know when the hemi fan kicks on hahahahahahahah. Much loader then the 4.7 & 3.7 that's for sure.


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post #7 of 20 (permalink) Old 05-03-2012, 01:41 AM Thread Starter
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air pocket ??? what is air pocket ? and u mean i have air pocket all the time ???
im posting a pic of RPM and gauge for u SAL-XK
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Last edited by itzme; 05-03-2012 at 01:58 AM.
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post #8 of 20 (permalink) Old 05-03-2012, 08:23 AM
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Quote:
Originally Posted by itzme View Post
air pocket ??? what is air pocket ? and u mean i have air pocket all the time ???
im posting a pic of RPM and gauge for u SAL-XK
Ya if you had air in the system it would cause problems like over heating and stuff but you never said the system was touched so you shouldn't have air in there. the first two parts I would change are the thermostat and water pump. change the thermostat first because its cheap enough to do. Next time also try putting it in neutral and give it some gas and see if it starts to cool. Also inspect your belt and idler pulley as well


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post #9 of 20 (permalink) Old 05-03-2012, 09:25 PM
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if he just bought it 2 months ago the previous owner could have serviced the coolant and not burped out all the air and it didnt present itself till the weather got hot im just saying it dosnt cost anything to remove the radiator cap and run the engine till it gets to operating temp then top off as needed and put the cap back on. still think that is the most probable cause of intermitent over heating i see it all the time
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post #10 of 20 (permalink) Old 05-04-2012, 05:34 AM Thread Starter
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sure I can try what you are suggesting but what do u mean by operating temp ? and top off ?
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