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Old 12-14-2007, 05:21 PM   #1
DMVue
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Default 3.5 l coolant temp sensor

Anyone know how to check it to see if its working properly?

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Old 12-14-2007, 07:59 PM   #2
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Default Re: 3.5 l coolant temp sensor

Yes, if you know where its located and can use a multimeter then copy/print the data table from post #6 ; http://www.saturnfans.com/forums/sho...coolant+sensor. If the engine starts up, runs a slight high idle during warm-up and gradually returns the rpm's back to a normal idle within 10-15 minutes of driving then the coolant sensor is operating properly. You can always replace it if its inexpensive.

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Old 12-14-2007, 09:29 PM   #3
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Default Re: 3.5 l coolant temp sensor

Quote:
Originally Posted by DMVue View Post
Anyone know how to check it to see if its working properly?
What makes you think it's not working properly?

Most of them hover around 3/8's and show little movement. There is variations in temperature that I monitor with my ScanGuageII, that don't show on the temp guage.

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Old 12-14-2007, 11:17 PM   #4
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Default Re: 3.5 l coolant temp sensor

Well for one, the gas mileage sucks big time 15.5 -16 50/50 city hwy driving and for two, the temp gauge reads at 1/4 mark when the engine is cold. I know some will say that I need to check the gauge but the sensor is easier to trouble shoot. I have had 2 SES lights come on for a split second but I guess it was not enough for Autozone to pull on their code reader. I am going Tomarrow to have a shop check it with a Tech II. Its probably just all in my head that my mpg is bad. Its been about 20-35 degrees F here in MI. I have been running my vents one notch off the floor and I have been babying the gas. The VUE has 90k miles on it with fresh trans fluid, original plugs and original O2 sensors. The Oil change that I have was accidentally done with 5w30, but not by me(don't know how someone could screw that up seeing as it says 5w20 RIGHT ON THE CAP . wheel allignment is perfect and tires are filled to 32 psi with nitrogen. Anyone see why I should not be getting 20+ mpg? Am I overlooking anything? I do know my way around a car pretty well so I am open to checking anything myself. sorry for the long post.

Dan in MI

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Old 12-15-2007, 01:01 AM   #5
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Default Re: 3.5 l coolant temp sensor

Tire pressure should be 35 PSI.
Won't make a big difference on the MPG but every little bit helps.

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Old 12-15-2007, 01:18 AM   #6
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Default Re: 3.5 l coolant temp sensor

Quote:
Originally Posted by DMVue View Post
Well for one, the gas mileage sucks big time 15.5 -16 50/50 city hwy driving and for two, the temp gauge reads at 1/4 mark when the engine is cold. I know some will say that I need to check the gauge but the sensor is easier to trouble shoot. I have had 2 SES lights come on for a split second but I guess it was not enough for Autozone to pull on their code reader. I am going Tomarrow to have a shop check it with a Tech II. Its probably just all in my head that my mpg is bad. Its been about 20-35 degrees F here in MI. I have been running my vents one notch off the floor and I have been babying the gas. The VUE has 90k miles on it with fresh trans fluid, original plugs and original O2 sensors. The Oil change that I have was accidentally done with 5w30, but not by me(don't know how someone could screw that up seeing as it says 5w20 RIGHT ON THE CAP . wheel allignment is perfect and tires are filled to 32 psi with nitrogen. Anyone see why I should not be getting 20+ mpg? Am I overlooking anything? I do know my way around a car pretty well so I am open to checking anything myself. sorry for the long post.

Dan in MI
15.5-16 mpg seems low. Where I live we have been a deep freeze for a couple of weeks now (-10F overnight and a highs consistently around +15F during the day) and I just filled up today and got 20.5 with 100% city driving. On my last tank I got 22.3 mpg with mostly city driving. Of course, the only way I can get even the 20.5 is to baby the throttle and keep it under 2,000 rpms always. When I first got the VUE 3.5 I thought it was a lot of fun to keep my foot in it (which it was) and I got numbers similar to yours.

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Old 12-15-2007, 09:17 AM   #7
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Default Re: 3.5 l coolant temp sensor

Quote:
Originally Posted by DMVue View Post
Well for one, the gas mileage sucks big time 15.5 -16 50/50 city hwy driving and for two, the temp gauge reads at 1/4 mark when the engine is cold. I know some will say that I need to check the gauge but the sensor is easier to trouble shoot. I have had 2 SES lights come on for a split second but I guess it was not enough for Autozone to pull on their code reader. I am going Tomarrow to have a shop check it with a Tech II. Its probably just all in my head that my mpg is bad. Its been about 20-35 degrees F here in MI. I have been running my vents one notch off the floor and I have been babying the gas. The VUE has 90k miles on it with fresh trans fluid, original plugs and original O2 sensors. The Oil change that I have was accidentally done with 5w30, but not by me(don't know how someone could screw that up seeing as it says 5w20 RIGHT ON THE CAP . wheel allignment is perfect and tires are filled to 32 psi with nitrogen. Anyone see why I should not be getting 20+ mpg? Am I overlooking anything? I do know my way around a car pretty well so I am open to checking anything myself. sorry for the long post.

Dan in MI
Your problem is temperature. Any vehicle will drop when the temps go down. I get around 25MPG in warm weather, but drop to about 20 in the cold. I'm also convinced that as gas prices go up, my mileage is going down. The quality of what you're getting varies a lot - without your driving style changing.

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