No Heat

[Dustinator]

2015 audi s4 DSG

I recently had my engine pulled at a shop that will no longer have my business and I'm now experiencing zero heat.

I pulled the hose off the heater core to attempt to bleed it a good amount of the old coolant came out although none of the current coolant.

Heater core has been flushed and is perfect. Hopefully you guys have some ideas [:)]

[Nelson G]

Take a look at these to post and read through the how to bleed the system after one has put a new thermostat in.

https://www.fcpeuro.com/blog/how-to-replace-the-water-pump-and-thermostat-b8-audi-s4

https://www.audizine.com/forum/showthread.php/641621-Complete-DIY-for-3-0T-Thermostat-Parts-Manual-photos-tips!

Hope this helps.

[Dustinator]

Guess it would be good to add I have zero flow to the heater core so just not sure where to go from here. Is it a continuous flowing system or does it have a valve?

[Nillious]

Sounds like it's just not bled out. When I did my pcv I had trouble getting heat afterwards. You need to run the car with the cap off and heat on full hot. Bleed the intercoolers and heater lines. Sometimes it fights you and just doesn't want to bleed. Sometimes it takes several bleeds to get it all out. It helps to have a scanner app or something to monitor actual engine temperature so it doesn't get too hot during the process. If it gets too hot shut it down and continue after it cools a bit. It won't really bleed properly unless the coolant is at least 190 to have the thermostat open. I wouldn't let it go over 220.

Start by taking the cap off and running the car with no cap heat on full hot. Get it up to temp and Raise the RPM to about 2500 and see if you start to feel some heat. If you do it just needs properly bled or drained and vacuum filled.

If you start to see the coolant level in the tank start to rise drastically and overflow that is a sure sign of air in the system. Just let it burp and keep an eye on the temperature the whole time.

[Dustinator]

Will try bleeding the system and report back.[:)]

[Geomatics_Tech]

Probably not your issue, but i had a shop install a short shifter last summer and come winter time i discovered the heat didn't work. Ended up that they didnt plug all the wires in on the back of the climate control (that had to be removed for the shifter install). Lazy mechanics! Shop paid for my audi diagnosis and repair but it was a waste of time.

[BrokeBichB8]

There's a vacuum actuated valve for the heater core. Trace the line running to the core and you'll encounter the valve. 9/10 times somebody didn't put the vacuum hose back to actuate the valve. That or the valve took a shit. Or as others have said major bleed issue. Takes a decent amount of warmup and driving to open the thermostat to bleed.