When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
If the little metal ball in the thermostat neck is working right, it should burp the air out automatically. If the metal ball is rusted/crudded in place like commonly happens, then no you have to wait until it warms up and the thermostat burps.