Engine Thermostat

Is this an old thermostat restrict water from being pumped into theengine and Colling correctly? can also do my jump temperature gauge needle around crazy?

1984 Chevrolet S10 2.8L V6 2WD

A bad thermostat locks generally open by design. I guess it could restrict circulation in some cases.

The gauge jump is probably caused by the temperature sending unit or the wire. The thermostat is not directly connected to the gauge.

Yes and yes. If you replace the thermostat, make sure to fill it with water coolant and distilled. Hard water can cause the thermostat to stick.

Yes and no. A thermostat bad will cause overheating and a lack of heat in winter. A "slow" thermostat could cause the car to get too hot before cooling off, then too cold then closed, but the cycle may take several minutes. If the needle is jumping, you should check the sending unit and gauge.

In thermostats good old days were good or bad, but today thermostats can go haywire and not completely open or completely closed and the result is erratic temperature control. Temperature gauges will rebound and could move from a cold temperature to warm temperatures, and then return.

The best solution is to buy a good quality thermostat, if you can find one in our time. It is a small object of many places sell them for $ 3 more but they are mostly trouble. If you can not find a thermostat good drill a 1 / 8 "hole in the flange of the thermostat so that water can pass through and stabilize your cooling system.

Make sure you fill your cooling system properly when you finish to help eliminate air pockets. Fill your radiator until its about six inches high, then start your engine and let it warm up. When the thermostat opens and the fluid level decreases slowly fill the cooling system on top of the radiator and the top of your tank overflow.

I had my gauge, water temperature Audi goes from normal to "overheating" in a few seconds. It was obvious to me that the car can not overheat so fast. So I changed the temperature sensor and water that problem has disappeared.

Yes, a former bad thermostat or coolant can cause problems. But if you have a temp gauge needle jumps around, concentrate on replacing the first sensor temp.

Yes Thermostat seniors tend to stick and overheat.