heater problems
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AudiWorld Newcomer
Joined: Oct 2011
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heater problems
the heater in my 2003 a4 only blows hot air when the rpms are over 2000. I flushed the heater core and bled the system, but still no heat. Anyone had this problem before or know what causes it?
Audiworld Junior Member
Joined: Oct 2002
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Going through the same thing... Check the front of your block for a small trickle of antifreeze coming down just behind the crank case pulley. If there is than it most likely is coming from your water pumps weep hole and it most likely means your water pump is on its way out.
AudiWorld Super User
Joined: Feb 2010
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From: Fort Worth, Tx
Agree that low flow is probably the culprit. Water pump is a posibility, i.e. requires higher RPM and thus higher Water pump speed to get the required flow. If you see no weeping, the impeller could be the issue. When or was the water pump ever replaced?
The other culprit could be back to the heater core. When you say "flush", do you mean simply back flushing it with a hose? If so, it still may be restricted thus requiring the higher RPM / higher flow from the water pump to get enough hot water through it to allow enough heat transfer to have warm air. I know my 02 with 197K has this problem and I have decided to change the core.
The other culprit could be back to the heater core. When you say "flush", do you mean simply back flushing it with a hose? If so, it still may be restricted thus requiring the higher RPM / higher flow from the water pump to get enough hot water through it to allow enough heat transfer to have warm air. I know my 02 with 197K has this problem and I have decided to change the core.
AudiWorld Member
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Don't forget about the J-plug issue that our cars have. J-plug is next to the thermostat, actually it is almost behind it.
Small pieces of the O-ring at the J-plug breaks down and eventually clogs the heater core...
AUDI has a TSB, about this issue.
If you just change or unclog the heater core, air will get into the system via the broken O-ring at the J-plug...and you will no longer get any heat or you will find that bleeding air from the system will be next to impossible.
Small pieces of the O-ring at the J-plug breaks down and eventually clogs the heater core...
AUDI has a TSB, about this issue.
If you just change or unclog the heater core, air will get into the system via the broken O-ring at the J-plug...and you will no longer get any heat or you will find that bleeding air from the system will be next to impossible.
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