Could not find this in the other threads. Early year 99 Sburb and the coolant temprature will not get above 130 or so on the gauge. Opened up the radiator cap when warm and ran it for 30 minutes, check it with a digital thermometer and about 130. No leaks anywere and fluid staying up in the resevoir. Done a lot of work on this baby, I assume the thermostat might be stuck open. Gets luke warm in the cabin and finally got cold enough to use heat here in Texas. Any other thoughts? Have seen 2 different aftermarket theromostats. One for like 150 the other for like 180. Need an educated recommendation on which variety? Part number would help me. Thanks in advance for this great site.

 

180' is the standard temperature.

 

Perfect. Was hoping someone would respond to me. I will see what I can find at Auto Zone.

 

Though we would encourage OEM replacement parts, Auto Zone has always been a reliable and courteous aftermarket supplier.