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Old 02-22-2016, 07:44 AM   #1
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Water temp gauge quits intermittently

02 Vig / 122k

This has now happened 3 times.

1 On the fly-and-drive drive back to CA from TX. Cruising on the highway, temp gauge went to 0, car was normal otherwise. Pulled off the highway, rebooted, started working like it never happened.

2 When my alternator died, but this was accompanied by many idiot lights and bing-bongs from the SID.

3 Saturday in stop-and-go traffic. Temp gauge fell to the bottom pin. No other indications, lights, sounds, steam, smoke, or problems. Restarted the car without taking the key fully out after shut down. Temp gauge still dead. Restarted again but took the key fully out, back to normal.

Any idears?
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Old 02-22-2016, 08:17 AM   #2
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faulty ground maybe? I'm sure you've already considered it. it could also just be a failing temp sensor.
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Old 02-22-2016, 10:40 AM   #3
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Yes, replace the coolant temp sensor and thermostat together. Either of them will cause that, and they are both cheeeeeeeaaaaap.
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Old 02-22-2016, 10:49 AM   #4
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I've never seen a faulty thermostat cause an incorrect water temp reading.
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Old 02-22-2016, 11:22 AM   #5
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I have.

On the T7 cars when they get sticky or partially clogged they will let the coolant temp drop enough that the gage will go into the "OMG SOMETHING IS HAPPENING" mode. T7 does not show you the true coolant temp on the gage. It will sit right in the middle if it's within it's programmed normal range (which is different depending on outside temp, how long you've been on the throttle, and how long the engine has been running). The normal range is usually set to something like 85C-105C, but you can actually change the range with a Tech2 in the MIU settings.

If it's outside of the normal range, it shows an exaggerated "I'M TOO HOT!" or "I'M TOO COLD!" reading, and you get the BING BONG and the red triangle ((!)) of stress.

And I know JK88 pretty well... he does not like the red triangle of stress.
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Last edited by DrewP; 02-22-2016 at 11:26 AM.
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Old 02-22-2016, 11:40 AM   #6
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And I know JK88 pretty well... he does not like the red triangle of stress.
HAH! do any of us?

I hate when that happens.
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Old 02-22-2016, 01:37 PM   #7
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Hahaha, for sure.
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Old 02-22-2016, 02:06 PM   #8
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And I know JK88 pretty well... he does not like the red triangle of stress.
Oh boy I remember that. Viggen memories
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Old 02-23-2016, 07:03 AM   #9
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And I know JK88 pretty well... he does not like the red triangle of stress.


So it went again yesterday while the a/c happened to be on. When the temp gauge dropped to nil, the a/c also quit. Upon restart, everything came back to normal.
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Old 02-23-2016, 07:24 AM   #10
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So it went again yesterday while the a/c happened to be on. When the temp gauge dropped to nil, the a/c also quit. Upon restart, everything came back to normal.
Humblebrag about warm weather...

But yeah, the compressor will kick off if the engine temp is fucked or if the ambient temp sensor is fucked. Go buy a thermostat and sensor and change them in 30mins.
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Old 02-23-2016, 12:11 PM   #11
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^^ yup.

That is what it's supposed to do.

It's 84F here today. If you see The Nino, tell him he's a punk and to bring us our rain dammit.
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