Heater Not Working Properly

Have no heat, new heatercore, new waterpump and thermostat.

It is getting col and would like to fix this fast as possible. I have owned this Audi for about 9 months I have all receipts from previous owner about 12k ago he had the heater core replaced, thermostat and timing done by an Audi dealer. Only warm air comes out the top vents. Both hoses going to the core get hot and I hear movent of vent flaps when I change the tem.

Well I did the easier of the two first. Took down the glove box and under dash pad. Changed from hot to cold the arm works great, smooth transition from open to closed. I am going to the local dealer to get some antifreeze.I think there is a bad mix in the car now "over the counter Autozone crap" I will take both lines from the heater core off and attach a hose to the one and see what flushes out. I tried bleeding it from there and did not see any kind of stream come out, it just dribbled out. I think we have found the problem. Fingers crossed!

And congrats on being a Father!

Well I could use a little more help. I tried taking both hoses off and attaching a garden hose to the inlet pipes going to the heater core.I put it one one then the other. It only flushed out some coolant nothing else. Should I attach the garden hose to a hose on the car or the pipe inlet? Still no heat. Thank you very much.

It flows out just as fast as the water from the hose.I will look at the flap again tomorrow. I wasnt sure were to hook the hose up[ to is it the 2 plastic parts of the heater core assembly or the hoses going in and out of the motor? Thanks again. One by one we will try all possible things

I have a september 1996 audi a4 1.9 tdi manual. Mileage is 171000 my heater is blowing out cold air.I have checked thermostat and replaced. Checked water pump its perfect because the strange thing is even I drive a long journey the coolant in the expansion bottle is just warm it never gets hot. Both pipes going into the matrix are hot and the flaps to control the heat, which are manual are all working perfect. Ive even flushed out the entire system. Temp hand and car is normal and car is working otherwise perfect. Is there anything else I need to do. Ps on mild days I do have slight heat coming out but not enough

Well at least we crossed the heater core off of the list. I will take the arm off and try opening and closing manually. To be sure. We are geting closer

Hello !
I think that the problem its the" valve " that opens the hot radiator water to the cabin heater core.

Check that and be sure that its not "stuck" closed.

Also check the heater core (be sure that its not Plug by blowing compressed air in to the inlet)

let us Know![/Quote:31d7b8c784]
reply by decky
sorry donot know where valve is. This audi has no air con have tried every thing nothing solves but if I knew where valve was I could check as I have a haynes manual for this car and it shows no valve either!

Just to be sure is the arm I am looking for located near the middle of the console under dash?

Well today all of a sudden the heater started to get more hot. Not really hot but a good deal warmmer. I took the arm off of the relay motor to see if I good get more heat but it did not get any warmmer. I am going to bleed the system a little more to see if that works. Can you figure out why? And is there anything more I can do to get more heat?