VW Golf GTi (115 BHP) Petrol 2001. Temperature gauge increases quickly despite short journey. Fan releases cold air only.
Your most probable cause for this is because your water valve needs replacement or repairing. Not all cars have a water valve that brings the heated coolant into the heater core unit.
Essentially, the heated coolant is brought from the engine block directly, into a mini radiator that has a fan to blow heated air into your vehicles cabin.
If that valve were clogged, or the switch itself to open up the water valve that blocks the coolant from going into the heater core unit, then you wont be able to get heat from the vents.
ALSO, another reason why your car might also be overheating as well, is you need to check your coolant levels as well to make sure it is fully filled up, if it is, then your thermostat might also need replacement.
good luck with your problem.
If your temperature is raising and your coolant levels are good then on VW between 1998 and 2003 it is most likely your water pump need to be replaced. This is because VW deployed a metal pump & plastic impeller water pump that is notorious for failure. If your coolant temp is high then all your large coolant lines should be warm/hot to the touch. If one or more of the large coolant lines are not warm/hot then that would confirm either a leak, which would be easy to tell because of the colored coolant visible on the ground, or your coolant is not moving, which again points to a bad water pump. Insist that your replacement water pump have an all metal construction.
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