I bought this car because my Saab was totaled due to a rearending. I did a full tune up on the car with all the plugs, wires, cap, rotor, air filter... so it runs great. I changed the thermostat because i though it would help the heater blow hotter and because it took a long time to heat up. Since i changed the thermostat the temp will constantly sit at just before overheating. Still no heat in the car. Changed the thermostat again. got a hose leak, besides the point... still runs hot. Put a Volkswagen thermostat in. Fixed leak. Installed new resevior cap. Still runs too hot! Water pump is clearly circulating the fluid when the cap is off, i see it squirting in there. radiator fan turns on every now and then, but the guage is still too hot. I dont know what to try now... Any ideas guys? Thanks!
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It is not possible to have that reset or turned off "Service Due!" without using a diagnostic scantool connected to the data link connector of the car. This is the only one way to reset service due light on 2007 VW Golf GTI.
The 1.8 had some issues with buildup of oil sludge in the engine due to the amount of heat from the turbo.I would suggest that if your having oil pressure issues to have the oil pan removed and clean the sludge from the engine. Also change your engine oil to a full synthetic such as royal purple or mobil 1.A k&n oil filter works well also.
The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case. if the car is not overheating, the thermostat is working fine.... replace or flush the heater core multiple times to try and eliminate sediment build-up.
The only common faulf is that the heater motor resistor has burnt out or corroded due to a water ingress . The ac take a control feed from the first position resistor when the fan position 1 is selected . Regards VW Audi Tech