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My Volvo's currently in service are two 740 turbos and three 240's. All are equipped with low coolant sensors.
The 240's are easier to do. Simply run a wire from a switched male connnector on the fuse box behind the cluster to a small red light installed in one of the removable panels beside the radio. I use one from Radio Shack that installs in a drilled 1/2" hole. From the light continue on to the large rubber grommet through the firewall and connect to a float switch installed (involves drilliing a 3/8" hole) in the reservoir and then to ground.
I am away from home so I do not have the link to the site where I purchase the switches. They run about $12.
With the risk of warping an aluminum head/blowing a headgasket caused by undetected coolant loss it seems to be prudent to install something like this.
Randy
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