I have an 02 Audi A4 B6. My car was overheating and it lost heat. I replaced my thermostat and it fixed my overheating issues but im still not getting any heat. when i rev the engine over 3000RPM or drive on the highway i am getting fair amount of heat. i bled the the cooling system like 5 times and still not getting heat. are their any other bleeder valves except the one by the injectors? note that i was getting heat before the the car was overheating.
thank you in advance.

 

you still have air in the system i guarantee it.

try running the car without the coolant cap on for about an hour..... watch the fluid and look for bubbles...

the fluid will jump to vibration, so not to confuse with air bubbles...

 

there should be a bleeder valve under the radiator. On the lower hose I believe. Like posted above you still have air in the system.

 

Ill bleed the system again. thank you. my friend suggested that it could also be a top coolant temp sensor? is this true?

 

Sorry, but it sounds like a blown head gasket to me. It will cause the same issues you are describing. I sure hope for your sake that isn't the problem.

 

You need to bleed the heater core! Pull the plastic shroud at the firewall to allow access to the battery and heater core inlet/outlet flanges, release the clamp on the right (driver side) hose and carefully pull the hose off until the hole near the end of the hose clears the flange, this is the bleed hole you are looking for. Do this while the engine is running at 2500 rpm's, collent and hopefully air will shoot out this hole. Also, before you bleed, take the one screw mounting the coolant expansion chamber off and lift/raise the chamber up high by placing a block of wood under it, make sure it is full. This will take a while, eventually air will bubble out of the hole in the heater hose. Make sure the hose goes all the way back on before you finish. Good Luck!

 

thank you. i will bleed the heater core!

 

i had this exact problem. turned out to be the coolant flange. see if theres orange gunk on the transmission bell housing passenger side.

also, to get my 02 to bleed, i had to rev the engine with the cap on and wait for the level in the res to drop, then fill it up while the engine was still revving then replace the cap. did that over and over. hint: it takes 2 people.