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> Low Coolant Light Stuck On After Expansion Tank Sensor Replacement
Ryan K
post Dec 2 2012, 08:26 AM
Post #1


Group: Members
Posts: 3
Joined: 8-June 10
Member No.: 73,834
Status: Offline
Location: USA
Drives: 2000 S70 and 1999 V70

I own two vehicles. One a 1999 Volvo V70 XC and a 2000 S70 AWD. These cars are practically the same exact car, except one is a wagon and one a sedan. Anyways, my problem is kinda strange and probably an easy fix. I just replaced my expansion tank on the V70 with a genuine volvo reservoir because of a crack in the original tank. After reassembling everything the way it was, the low coolant light is now on even though the tank is filled. I noticed the expansion tank had a small weight that goes up and down to sense whether the tank is full or empty, and that is in the proper position (up = good, down = low). The sensor is plugged in correctly. The strange thing is that I wanted to test the sensor to make sure it didn't go bad on me all of a sudden, so I removed the sensor from my Volvo S70 (other vehicle, but the exact same) and installed it in my Volvo V70 to test, and I had the same problem. After moving the sensor back to my S70 (the one working initially), I had the exact same problem as the V70 where the low coolant light will not turn off. So now the exact same problem is happening to both vehicles because the sensor was removed and reintalled. Is there some strange reset that needs to be done to get this light to turn off? Thanks in advance for all your help.

This post has been edited by Ryan K: Dec 2 2012, 09:39 AM
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post Dec 16 2012, 10:06 AM
Post #2


Group: Members
Posts: 17
Joined: 26-December 09
Member No.: 66,578
Status: Offline
Location: USA
Drives: 99 V70XC, 95 850glt

pulling on the wires to the sensor can screw it up. I know and have a few old ones in my garage! I have never put a meter to the old ones and can't tell you how they work. but they are either good or bad, so buy a new one for both of your cars. the hard thing to do is to remember to disconnect the sensor and not pull the wires out, when you lift the expansion tank!
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