I have a 180* Drilled Thermostat from ZZP. I have had it installed now for a couple months (since beginning of spring). And when driving to work yesterday the gauge in the car was normal, rose up about a quarter of the way (im in MN, it was about 40* outside) and stayed there. I got off work and drove home and on the way home I realized the whole way the needle on the gauge never rose up, stayed pinned at the bottom. So I went home and when I parked the car and turned it off the Fans were still running, first time I've ever heard them running on my car. The car wasn't driving funny though. So I ended up picking up my boss from work because he wanted to go to the casino and I had to drive because he was already drinking, so I had a good 45 Minute drive on the highway, needle never moved. On the way home, same thing. Work today, same thing. The fans turn on but the needle doesn't move. And when I popped the hood after the casino, I touched the engine block, COLD, usually it's so hot I can't touch it.
So I had my buddy come over and we tested the thermostat by boiling some water and throwing the thermostat in the water and watched it open up. Then we took it out and watched it close back up. So we threw the thermostat back in the car and let it sit running for 10 minutes. I would even rev it to 2k rpms to see if that would help. No luck.
Does anyone know what could be wrong here? Maybe the gauge sensor is loose? any info would be great.
(2001 Monte Carlo SS, 38k miles)