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  #1  
Old March 1st, 2013, 11:32 PM
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Overheat or not

So I finally got around to replacing my temp sender today. I have been driving around with it inoperative for two years with no issues (I know I should have done this earlier). Any ways after driving around for ten minutes on a cold soaked engine my temp gauge looks like this. Soooo.....has my engine really been overheating for two years and I didn't know it or did I buy the wrong temp sender. I installed this one which is for a 3.9l but was told buy rovers north that it was the same for a 3.5L which I have.
http://shop.advanceautoparts.com/web...rm=temp+sender

Thoughts, overheat or wrong sender?
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  #2  
Old March 2nd, 2013, 07:37 AM
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Makes me wonder if that's a diesel gauge. Wy not just do a VDO? If you used thread tape that could cause you to get a bad reading. Have you been able to check the temp with an infrared thermometer?
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  #3  
Old March 2nd, 2013, 07:43 AM
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It seems that the different year gauges have a different resistance so not all of the senders work correctly with all of the gauges. What color sending unit did you get? I used the green one but have the newer gauges on the 300Tdi.
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  #4  
Old March 2nd, 2013, 08:46 AM
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Quote:
Originally Posted by MC22958 View Post
It seems that the different year gauges have a different resistance so not all of the senders work correctly with all of the gauges. What color sending unit did you get? I used the green one but have the newer gauges on the 300Tdi.
The sending unit looked just like the one from the link, a golden color if you will. I haven't been able to use an infrared thermometer yet, will have to find somebody around her in Clovis that has one
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Old March 2nd, 2013, 03:30 PM
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So I tested the engine temp with an infrared thermometer and got anywhere from 190 to 214 degrees depending on where I shot on the manifold. I thought that was normal? Temp gauge still through the roof though....
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  #6  
Old March 2nd, 2013, 03:33 PM
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Yeah those temps are pretty much normal.

Do you have a multimeter? We can measure the resistance of the sender and see what it's doing. I am going to guess you have the wrong sender for the gauge you have.
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  #7  
Old March 2nd, 2013, 03:40 PM
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I would start by checking the ground or possibly running a dedicated ground to the gauge. If that does not resolve the issue I am guessing that you have a mis matched gauge / sender.

Personally I would go with a VDO and matching sender so you can feel safe / confident in the reading.
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Old March 2nd, 2013, 04:16 PM
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Quote:
Originally Posted by navydevildoc View Post
Yeah those temps are pretty much normal.

Do you have a multimeter? We can measure the resistance of the sender and see what it's doing. I am going to guess you have the wrong sender for the gauge you have.
Looks like 215 ohms, unless I am measuring it in correctly

------ Follow up post added March 2nd, 2013 04:17 PM ------

Quote:
Originally Posted by atpick View Post

Looks like 215 ohms, unless I am measuring it in correctly
Incorrectly I mean
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  #9  
Old March 3rd, 2013, 08:34 AM
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What was the part number of the sender you replaced? There are a few senders that will fit but only one that will give you the correct reading with your gauge.
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  #10  
Old March 3rd, 2013, 08:45 AM
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Quote:
Originally Posted by MC22958 View Post
What was the part number of the sender you replaced? There are a few senders that will fit but only one that will give you the correct reading with your gauge.
TU333, link is in original post
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  #11  
Old March 3rd, 2013, 06:59 PM
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Quote:
Originally Posted by dave_lucas View Post
I would start by checking the ground or possibly running a dedicated ground to the gauge. If that does not resolve the issue I am guessing that you have a mis matched gauge / sender.

Personally I would go with a VDO and matching sender so you can feel safe / confident in the reading.
Do you know what size VDO gauge is a direct fit, 2 inch or 2 1/16?
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  #12  
Old March 3rd, 2013, 09:21 PM
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2 1/16 ...i used a steward warner gauge .....white needle black ring matches alittle better i think
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