Hey guys, I would like to get your input on this before I start tearing things apart. Driving around in my local area, my heat is almost non-existent. But when I took her out on the back roads tonight (doggin her out a bit playing with the dyno app on my phone) my heat showed up, but still not all that hot. In addition, I never see my temp guage leave the 170-180 area after it heats up, no matter what I do to her, and since I bought this car used, I don't know if maybe the prior owner took the stat out or if it's bad... or if something else might be causing it. Thoughts?

 

The stock coolant gauge is awful. Disregard anything it tells you, other than a cold engine, somewhere in the normal operating temperature area, and overheating.

If you have no heat at idle with a fully warmed engine, carefully grab both heater hoses. Are they hot? Only one hot? Have you even checked the coolant level?

 

Of course I checked the coolant. I also checked the hoses going into the core as well as the mains. I am a mechanic by trade, after all (wheel vehicle mechanic in the army)... just not familiar with the ls1. But it seems as though I found the issue anyway... the other day the heat started blowing warm, so my assumption is that there was a blockage in the system. I'll be flushing it this weekend. Thanks for the input though, I appreciate it.

 

You can't go wrong swapping the thermostat. Just make sure you get the fail-safe type.