Flat4 Posted August 20, 2012 Share Posted August 20, 2012 Recently my car has begun to overheat after driving in city traffic for about 15 minutes. The engine temp needle rises to just below the red marking, the idle drops, the AC goes hot and the car shakes as if it's about to turn off. Then, after about 5 minutes of this behavior the AC goes cold again, the needle drops back to about halfway and all is normal. The car is a 2006 with about 157,000 miles on it. Head gaskets, timing belt, and coolant were all replaced at about 110k miles. The water pump and thermostat have never been replaced. I have a feeling it's the water pump because the coolant looks good and is completely full. I just wanted to see if anyone has any other ideas as to what it might be before I buy the water pump. Any input? Link to comment Share on other sites More sharing options...
Whatisit Posted August 21, 2012 Share Posted August 21, 2012 are the fans kicking on when it gets hot? Link to comment Share on other sites More sharing options...
Flat4 Posted August 21, 2012 Author Share Posted August 21, 2012 Yes they are. Link to comment Share on other sites More sharing options...
aaronmjr Posted August 21, 2012 Share Posted August 21, 2012 Any belt noise when the issue is going on? Link to comment Share on other sites More sharing options...
Flat4 Posted August 21, 2012 Author Share Posted August 21, 2012 Nope, no belt noise. Link to comment Share on other sites More sharing options...
Flat4 Posted August 22, 2012 Author Share Posted August 22, 2012 The car threw a code today; had it checked and it came up as. P0037 SUBARU - HO2S12 Heater Control Circuit Low Any ideas? Link to comment Share on other sites More sharing options...
Osei Posted August 23, 2012 Share Posted August 23, 2012 The code means that there is a problem with the heater element circuit of the heated oxygen sensor. Water getting inside the heated oxygen sensor connector can caused the heated oxygen sensor fuse to blow, which is a very common problem for this type codes. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors. http://engine-codes.com/images/help.png Help with this When is the code detected? The P0037 is set when the ECM detects an excessively low voltage through the heated oxygen sensor heater circuit Symptoms - Engine Light ON (or Service Engine Soon Warning Light) P0037 SUBARU Description Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. The faster the heated oxygen sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module (ECM). In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground. The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications. http://engine-codes.com/images/o2_heater_circuit.gif Need more help? Read more: http://helpforcars.net/obd_codes/p0037_subaru.html#ixzz24KcVJYtp O. Link to comment Share on other sites More sharing options...
Loscaldazar Posted August 23, 2012 Share Posted August 23, 2012 The other thing to note is that your car has now over heated, which means headgasket could be damaged again.... Link to comment Share on other sites More sharing options...
Flat4 Posted August 23, 2012 Author Share Posted August 23, 2012 Hmmm. Well the car isn't burning water that I know of. But I'll check on that O2 sensor. Thanks guys. Link to comment Share on other sites More sharing options...
Leviman Posted August 24, 2012 Share Posted August 24, 2012 You let your car get into the red? You never shut it down? Link to comment Share on other sites More sharing options...
Flat4 Posted August 24, 2012 Author Share Posted August 24, 2012 No, it would go to just below red. It never actually touched red. But no, I wouldn't shut it down. Link to comment Share on other sites More sharing options...
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