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Re: water temparature gauge
The specific location of the sender is on back of cylinder-head near by vacuum-fuel double pump. There is an assurance clip and a rubber sealing O-ring. Heed of antifreeze solution temperature!!!
Before you try to change the sender you must be sure that the sender is out of order. First you must check the thermostat operating. The thermostat location is on back of alternator at the bottom side of the bracket. IMPORTANT: It is NOT necessary to replace the alternator if you want to change the thermostat !!!
1. Cold engine. Start up the engine and watch of the water temp indicator. After first value 60 Celsius Degree you still warm up the engine until the lifter (pointer) reach 80 C deg. (second mark after 60 C deg.). At this time you let engine running at idle speed and check with your hand the thermostat plastic housing and hose temperature in bottom left side of the engine. Heed of alternator driving belt and ventilator fan !!!
2. If the thermostat is good the hose must be cold until the water temp indicator reach almost 90 C deg.
3. The thermostat opening temperature is 87 C deg.
4. If the hose is already warm the thermostat is out of order.
5. If the thermostat and the temp sender are OK the last piece out of order will be the instrument cluster.
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when a temp gauge drops to cold ,it indicates a problem in the cooling system
temp gauge sender units need water to activate the resistance that makes the gauge read so a falling gauge indicates no water around the sender unit --- air lock in the system--faulty wire connection to the gauge sender unit
the ac unit is not connected to the temp gauge so there may be another separate problem there
the temp sensor is an entirely different unit to the temp gauge sender unit and the short term working would be from an altered coolant level from changing that sensor --air lock in system
the temp sensor connects to the ECM to activate the fans and monitor engine operating temp so as to keep the air/fuel mixture exact for the engine conditions
the temp sender unit just makes the temp gauge read
a faulty thermostat will either be stuck open and the engine temp will take a long time to rise or it will be stuck closed and that will cause an overheat very quickly
a few basic's first , does the temp gauge go into the red , if not where does it level off at ? if the temp gauge does'nt move would suggest the temp sender unit is at fault , have the OBD codes read this should tell you what if any sensors/switch's are faulty, does the engine use a lot of coolant , are you always having to top it up ? if so would indicate the water pump is not working , to test run engine at stationary and hold at 2000 rpm after 10-15 minutes yuo would expect the engine to be at operating temp if the water pump isn't working the radiator top hose will be very hot and the bottom hose will be cool,if the top hose is cool as well then the thermostat may not be opening , after all this let me know how thinga are
The rising and falling temp gauge indicates a low water level in the cooling system as hot water is splashed against the sender . Have a pressure test done on the coolant system and find the leaks . Remember to check inside in the heater core as well. Have a compression test done to check for head gasket and cracks
If your temp gauge has only the cold (C) or hot (H) letters then the operating range would be the width of the needle under 1/2 way between c and h. If it remains steady at slightly over 1/2 way that would be just the setting of the gauge. How to get to know where the needle would sit at a specific position in relation to water temp. Do the following Remove the temp sender unit and attach an earth wire to the body of the unit to earth. Place the sender unit in a container of water up to the threads .Put a mercury thermometer in the container beside the sender unit Apply heat to the container and watch the gauge needle move in relation to the thermometer reading. Operating temp will be about 80 degrees C on the thermometer and that would be about 1/2 way on the gauge.
Check that the wire to the temp sender unit is not shorting out before the sensor As water temp rise so the resistance in the sender unit decreases and the current increases so a short would indicate hot water. REmove the wire and see it any thing happens and if it stays cool then, Replace the sender unit
What do u mean by spark knock? Missfire? Temp gauge not working could be a few things, sender fault, no water, gauge fault or wiring. Check u have water in it. Then find the sender and earth it out, gauge should go all the way up, if it does replace the temp sender, if not it's gauge or wiring.
Let me know about the spark knock.. Not sure what u mean
possible Temparature sensor fault - most likely resulting in an over rich mixture.
The temp sender/sensor is a cheap part, available an stocked at most good parts shops - they may even fit it for you if you ask nicely -
tell the guy on the parts desk the emiisions are very high and you think its the temp sender, Golf 1.4 2001, he'll pick out the sender and you ask him if he'll fit it or show you where to fit it, theyre usually good chaps at parts shops, the sender is a bolt that bolts into the engine block it has a connector for the wire - it is the simplest part you're likely to see.