1997 audi A4 heater blowing cold air

needs a new blower motor ,brushes worn by the sound of it

Flap motor on heater box

I’m happy to assist further over the phone at https://www.6ya.com/expert/howard_977676954994c5b2

You have air trapped in system , change thermostat , bleed air from system , let it run hot while adding coolant with blower full blast on all front and rear heaters .

Cannot say i do offhand but yes your diagnosis is correct thats for sure and to get to anything i think you will need to remove the dash ,not a difficult job just time consuming thats all and remember to refit all the screws back in use a mobile phone to take lots of pics as you take it apart and hope your back is ok for all the bending upside down to do this job

heater core clogged or heater valve

Hello i have Audi A4 1.8T Year 1996.i have a problem with the display's of the a/c sometimes shows numbers sometimes dont work all day,also i have the problem with air comining the enterier.it blows air only to the windshield.can somebody help me to solve this problem.thanks
[email protected]

I suspect from your description, Failure of the Water Pump.
Regards,DT

yes, very possible. but first check your fluid level, thermostat.

You will have to change the heater core. 9 out of 10 times, when the heater is not heating the air, it is a bad heater core.

they told me it was the a/c server some kind of valve that switches it to cold or hott mine just has cold air coming out check they its under ur dash so look it up on line and look for it , its about 80 to 100 dollars.......