Question about Audi A4

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Only drivers side heat is blowing cool air, passanger side is working fine. are there two different heating untis for this car since it has two separate controls? could it be a sensor or a flap? flap sounds like it is moving....the dealer is being difficult in fixing this problem. is the only way to know to pull the dash? thank you 07 a4

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No there is one heating unit that has a flap that is controlled by the passenger side vs. driver side cooler or hotter knob or setting, if it's like my Cadillac. It's called a blend door. There is only one heater core that feeds the two separate sides.

Will have to pull the dash, and inspect the vacuum lines and cables.

If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.
Heater Housing

  • The heater housing is usually under the dash and must be removed to gain access to the heater core.
  • Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.
only drivers side heat is - f74-01.gif The heater housing is disassembled to get to the heater core.
Heater Core
  • Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
  • Remove the heater coolant hoses.
  • Remove the cable and/or vacuum control lines (if equipped).
  • Remove the heater core securing brackets and/or clamps.
  • Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
  • To reinstall the heater core, reverse the removal steps.
When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.

Posted on Nov 12, 2010

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