Should a thermostat open all the way?

It should be swirling vigorously. When an engine is warm, the thermostat is in the open position. This allows the coolant to flow through the radiator causing vigorous movement.

How much is a thermostat supposed to open?

When is a thermostat fully open? The thermostat is usually fully opened at 15 – 20 degrees (F) above the opening temperature.

Where does a car thermostat open?

As it heats up, its valve opens about an inch, apparently by magic! If you’d like to try this yourself, go to a car parts store and buy one for a couple of bucks. The secret of the thermostat lies in the small cylinder located on the engine-side of the device.

What is the coolant thermostat code on a GMC Envoy?

GMC Envoy P0128: Coolant Thermostat – Below Temp. P0128 is a relatively common OBDII trouble code. It is triggered when your GMC Envoy‘s coolant temperature fails to reach the proper operating temperature. It’s a generic powertrain code, which means that regardless of who manufactured the vehicle, it’ll have the same meaning (1996+).

Why is my GMC Envoy p0128 not working?

Lack of heat – The biggest symptom of the P0128 trouble code in the GMC Envoy is going to be lack of heat. When the thermostat doesn’t bring the engine all of the way up to the proper operating temp, it means that the water going through the heater core isn’t as hot.

What is the OBDII code for GMC Envoy?