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Discussion Starter · #1 ·

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)

 

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T-stat

I had the same problem with my 2000 Monte Carlo SS. Only mine was with a 160'. I have since switched to a 180' with no problems but I'm in NJ so it's not that cold here yet. We'll see what happens this winter. I think it might be the PCM in the Montes. I don't think they like the cold t-stats. I havn't experienced any negative effects of running the colder stat but you can contact Zoomer from ZZP for advice. He runs his car cold all the time.
 

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Discussion Starter · #3 ·
Thanks for the reply.

The only other thing I could think of to do was reset the PCM. So just an hour ago I got home and undid the battery to reset the PCM. Left it alone for 20 minutes, came back, started the car and FINALLY the gauge works. 3 days of driving without the gauge workin, and a bit of troubleshooting and I finally got it working right.

k0bun, you were right though, the PCM in the Monte just must not like that Cold Thermostat.

:cool:
 

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Rap Life said:
Thanks for the reply.

The only other thing I could think of to do was reset the PCM. So just an hour ago I got home and undid the battery to reset the PCM. Left it alone for 20 minutes, came back, started the car and FINALLY the gauge works. 3 days of driving without the gauge workin, and a bit of troubleshooting and I finally got it working right.

k0bun, you were right though, the PCM in the Monte just must not like that Cold Thermostat.

:cool:
I have had the same thing happen on my monte about 6 times, a reset and walla good to go. Keep in mind our gauges are controlled by the BCM and our fans are controlled by the pcm.
 
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