Tuesday, September 27, 2011

Why does my 2001 Audi A4 Quattro have weak heat only while driving otherwise there is no heat at all?

While driving my Audi blows some heat but even on HI the heat that comes out is only warm and when the fan in set to high only Luke-warm, and when the car idles the heat goes out entirely and blows only cold air.|||There are two VERY common problems for this





#1 - Thermostat. Check the temperature gauge while the car is running. If the gauge is in the middle after the car is warm, then you're OK. if the gauge is at 1/4 gauge or less, then your thermostat is stuck open, and coolant is flowing freely instead of being able to pick up heat from the engine.





#2 - Plugged heater core. I run into this problem more often than the thermostat. At our shop, the firs tthing you can try is unplugging it, this is very easy. unhook the coolant lines going to the heater core, they run straight into the firewall, underneath the cowling in the engine bay. Cut a spare piece of coolant line, connect one to a hose, and the other to one of the tubes going to the heater core. turn on the hose, let the water flow through the heater core for a few minutes, and then do the same through the other line. reconnect the hoses, and test the heater. you may need to do this a couple of times to get it working well. (my experience is 2-3 flushes, with a warm-up period in between each flush.|||most likely u have a stuck open thermostat or bad heater control valve.....|||low/no coolant


or stuck thermostate


or bad waterpump


or heater core or HC valve


or blend doors stuck


or..or

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