Question about Cars & Trucks
Probably not dangerous.
Assuming the radiator is full of coolant, it could be a normal thing where the thermostat is opening and closing at 195 degrees.
Or the cooling fan could be going on and off.
The thermostat opens at 195 degrees on most cars and the cooling fan comes on at 220 degrees.
Posted on Jan 15, 2013
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Posted on Jan 02, 2017
The sensor is right next to the heater hose outlet on the front passenger side of intake manifold. It is very small with an oval shaped connector going to it. I have the same engine.
Posted on Oct 21, 2008
Look for a loose connection to the temperature sender unit on the motor.
If all connections OK, you may need a new temp sender unit.
Posted on Jul 28, 2009
it sounds like a possible head gasket problem,you can get the fluctuation from combustion gases getting pumped into your cooling system and creating gas pockets,i would suggest taking it to a shop and have them do a block test to look for combustion in the cooling system to confirm the problem,that way you will know for sure,if it comes up negative they can also perform a flow test to make sure there is no restriction in the cooling system such as a plugged radiator or a bad thermostat,hope this sheds a little light on it
Posted on Sep 12, 2009
Testimonial: "I bet you've hit on the problem ! Car has been "using " antifreeze for a couple years now, with no leaking anywhere. Lost through the head gasket ?"
That sounds like the classic symptoms of a cracked ECTS (temperature sensor). It is located on the head near the upper radiator hose and battery. You will see two wires (likely a yellow and a black) going to a small sensor hiding in a little cubby hole. If you pull off the connector (there are two points that if you squeeze it lets the connector come off) you will probably see that the connector is corroded because the plastic body of the original ECTS cracked and let a small amount of coolant into the connector. The ECTS is only about a $10-15 part, be sure to get the updated one with a brass body. Then the hard part is you will likely need to get a new connector, one of the best places for that is a junk yard, the temp sensor for the transmission and the air temperature sensor near the air filter use the same connector. When putting this in be sure to solder the connections and cover that with heat shrink tubing. There are video's from Richpin06A on youtube that will show you how if you have any doubts. The saturnfans forum is a great place for info too,
Posted on Nov 14, 2009
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