There isn't a bleeder valve. If you have no heat, chances are it is low on coolant.
According to two manuals, you can do it one of two ways. One is by using a vacuum bleed via the degas bottle. Most people don't have that tool. So, I attached the directions below for standard refilling. Make sure the coolant reservoir is at the full mark. Start the engine and turn the heat on high. Allow the engine to warm up. If you get no heat or the temp gauge doesn't move, turn the engine off and follow the directions listed below.
Note, if you are still unable to get heat, I have actually loosened the return heater hose clamp and allowed the coolant to bleed through. It's just a thought. The only issue is you will lose coolant and it's a bit messy. LOL
Let me know if this helps or if you have other questions. One other thought. I suspect you drained the coolant and are refilling it. If that isn't correct and you just lost heat, let me know. That could be a totally different issue.
See pics below. I highlighted the main points.
Images (Click to make bigger)
Tuesday, October 31st, 2023 AT 8:34 PM