Question about 1994 Volkswagen Golf

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Coolant temperature sensor?????

Ok so i start my car everything seems to be ok, the heat starts pumping im all happy and warm. after a while im driving and the temp is going to like 110, 120 the fan does not seem to be going on and now im freezing because i have cold air blowing from my heater. why does my car hate me?
can the coolant temp sensor cause this problem ? to have hot air then cold? i have had the thermostat changed and the fan does work i find the top hose gets hot. the bottom hose stays cold for a while. when i leave the rad cap off sometimes the fan will kick in other times the coolant just starts coming out of the tank? i hope anyone reading this is not as confused as i am writing it do these cars run at hight temperatures? or what is normal?

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  • dj_shane007 Nov 10, 2008

    i will do my best i start the car because i keep thinking there is air in the top hose and take the cap off to bleed it or get the air out it takes forever for the temp guage in the car to get up to 90 at this point the top hose is very hot but the bottom one still cold a couple times the bottom hose finally starts to heat up and the fan goes on then others the coolant just starts backing up out of the coolant tank and the temp guage in the car is like 110 or 120

    if i just go driving the temp guage in the car usually goes above 90 to like 120 or 130 and i have hot air coming out of the heater but then it just starts comming out cold its friggin wierd

  • dj_shane007 Nov 10, 2008

    what is the normal temperature on the dash for these cars its in the middle which is 90 correct?

    ITS A 1994 GOLF 2.0 GL

  • dj_shane007 Nov 10, 2008

    oh ya and when the car is just idling its cool air comming out when i rev the engine its gets hot


2 Answers

Since the fan switch is on the left side of the radiator it must be circulating some coolant to turn the fans on. It sounds like not much coolant is circulating to the heater core. Has the cooling system been cleaned/flushed lately? Or like was stated above it has air in the system and needs bled out.

Posted on Nov 10, 2008

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Um...strange ...engine temp reaches 210 before thermostat opens and lets water circulate go on before that normally..180 or air from heater going to cold air? strange...could you elaborate for me /us?

Posted on Nov 10, 2008

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Heating System

The Engine Coolant Temperature (ECT) sensor is mounted in the intake manifold and sends engine temperature information to the ECM. The ECM supplies 5 volts to the coolant temperature sensor circuit. The sensor is a thermistor which changes internal resistance as temperature changes. When the sensor is cold (internal resistance high), the ECM monitors a high signal voltage which it interprets as a cold engine. As the sensor warms (internal resistance low), the ECM monitors a low signal voltage which it interprets as warm engine.
0900c1528008f125.jpgFig. 1: View of the Engine Coolant Temperature (ECT) sensor 0900c1528008f126.jpgFig. 2: Engine Coolant Temperature (ECT) sensor locationTESTING
See Figures 3 and 4
  1. Remove the ECT sensor from the vehicle.
  2. Immerse the tip of the sensor in container of water.
  3. Connect a digital ohmmeter to the two terminals of the sensor.
  4. Using a calibrated thermometer, compare the resistance of the sensor to the temperature of the water. Refer to the engine coolant sensor temperature vs. resistance illustration.
  5. Repeat the test at two other temperature points, heating or cooling the water as necessary.
  6. If the sensor does not meet specification, it must be replaced.
0900c1528008f120.jpgFig. 3: Intake Air Temperature (IAT) and Engine Coolant Temperature (ECT) sensor wiring diagram 0900c1528008f095.jpgFig. 4: ECT sensor temperature vs. resistance values

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