Vannin' Community and Forums Forums Chevy How to.... Water Temp Gauge Quit

After it sat in driveway for 3 weeks, drove it to the store and notice the water temp was not functioning. The needle just lays down on the 100 for the whole time I'm driving. It never moves or jumps. I'm thinking Coolant Temperature Sensor???

When I first got my 93 G20 the temp gauge didn't work. I had to replace the sender. Possibly your issue too.
It's located on the driver's side cylinder head just under the exhaust manifold.

Can I access this sensor from below the van without taking the engine cover off?

You may be able to get it from underneath, but I pulled the doghouse. It was a tight squeeze though and do yourself a favor and drain the coolant first...unlike me that tried to be quick and ended up dumping coolant all over the place.