When I am driving my 2001 Chevy Venture I notice that the temperature guage goes up about half way and then quickly will drop back down to completely cool. It will do this repeatidly while I am driving. I have also noticed that when I go to start it in the morning and just leave it running I will come out and the temperature guage will be half way up but no heat is coming out of the vents, but then when I start driving the temperature guage falls to a normal level at about 1/3 of the way up and heat begins to come out of the vents. Any idea what is going wrong?
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Yes, the temperature gauge should normally stop in the middle, between the cold and hot points on the gauge. When the engine is cold the thermostat will be closed and will keep recirculating the coolant in the engine block until it warms up sufficiently. Then the temperature of the warm coolant will cause the thermostat to open the channel to the radiator to get rid of excess heat, which should stop the coolant from over heating. So the effect of the thermostat keeps the coolant at a fairly stable temperature. When the coolant runs low, it can't transfer enough heat to the radiator and the coolant and engine then over heats. Watch for radiator leaks under your car after you have been driving it. If the coolant goes low again fairly quickly you could have a leak in a hose or the radiator itself.
If heat gauge reads normal, stays in the middle, then you do not need to mes up with the thermostat. I own a 2000 Chevy Venture and changing the thermostat was not fan. It may be the Temperature Control Module, which you can buy for $45 and replace without problem, or may be an partially obstructed heating core. The GM Dex-Cool antifreeze, the read one, has additives, but if you do not flush the radiator every 2 or 3 years, can result in partially clogged heater core. I have done on my car twice till now, and replaced with green Prestone, on my own risk. Hope this will help. If need more information let me know. A have the Haynes manual for Chevy Venture 2000, and I am a car dealer.
check the make sure you have no air in your system if there is an air bubble trapped in behind the thermostat your thermostat wont open and your car will heat up and stay hot while letting a small amount of coolant through the bypass so it wont overheat
If you are adding anti-freeze every time this happens, you are still loosing coolant some were. I assume there are no puddles on the garage floor or where you park the van? Check the oil dipstick and make sure the oil is not a "milky"color. Check the passenger side carpet for wetness, you may have to pull it back.
If all of that is OK, you are still burning the coolant by way of the intake gasket or head gasket.
Good luck, let me know.
2000 chevy venture run good but my lights flickers and have to jump. After I jump the van and put my meeter on the battery its reading 14.volts at idle. I can drive around to store cut the van off come out it starts fine leave it overnite and it don't started.