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Old 05-01-2014, 01:43 AM   #1
Dake
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Default Temp gauge change

After having a new water pump and serpentine belt put on my 98 SL2 the temp gauge now reads above the 1/4 line on the gauge, before the new water pump the gauge read below the 1/4 mark when driving around town. Any ideas why the change? Thanks

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Old 05-01-2014, 02:02 AM   #2
el diablo viejo
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Default Re: Temp gauge change

The thermostat or ects must have been replaced also. Running at 1/4 on the gauge usually indicates a failed thermostat. Correct reading should be 3/8 to just below 1/2, so it sounds like you are where you should be.

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Old 05-01-2014, 06:10 AM   #3
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Default Re: Temp gauge change

Either the above took place, or the flow change moved the gauge. It's not uncommon for less flow to give greater cooling in factory systems. Though in theory the thermostat should compensate, under drive pulleys often move the temp gauge down. If you had bad corrosion or flow problems with the water pump, you may have gone from less flow to normal flow and thus sped things up.

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Old 05-01-2014, 07:25 AM   #4
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Default Re: Temp gauge change

Quote:
Originally Posted by Dake View Post
After having a new water pump and serpentine belt put on my 98 SL2 the temp gauge now reads above the 1/4 line on the gauge, before the new water pump the gauge read below the 1/4 mark when driving around town. Any ideas why the change? Thanks
You need to Replace your Coolant Temp sensor to the Brass Sensor and Replace the Thermostat, I usually do these as a pair everytime, These should have been replaced with the Waterpump due to the current readings that you had on your gauge.

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Old 05-01-2014, 01:32 PM   #5
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Default Re: Temp gauge change

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Originally Posted by SL19302 View Post
You need to Replace your Coolant Temp sensor to the Brass Sensor and Replace the Thermostat, I usually do these as a pair everytime, These should have been replaced with the Waterpump due to the current readings that you had on your gauge.
Thanks for all the great Info.

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Old 05-01-2014, 01:39 PM   #6
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Default Re: Temp gauge change

The temp gauge on another family owned 98 SL2 is always just below the 1/4 mark driving around town unless it get really warm, then it moves above the 1/4 mark. So it sounds like that car is the one that need a new temp sensor and coolant flush. Thanks again for all the Info. Great site, I have got to say that the cool sounds that the SL2s make is why I like them so much.

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Old 05-01-2014, 08:27 PM   #7
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Default Re: Temp gauge change

If the ECTS is bad it will create a rich mixture and keep temps lower than usual. The thermostat will often keep temps down, but not have as much effect on mixture. Usually ECTS will rob MPG more due to that.

If in doubt, use a scan tool or meat thermometer in the reservoir to determine actual operating temp vs gauge. Some people get a lower reading on the gauge even with operating temps in the normal ranges. They are far from precise, and combined with the sensor variation for any given actual temp, the gauge position isn't a given.

There was a member not long ago that switched his thermostat and ECTS only to find the gauge stayed on 1/4 or slightly above anyway. Checking actual temp first can save you money, and checking actual temp vs sensor reported temp verified ECTS is working properly.

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