See if you have a heater control valve on one of those heater hoses and if so, feel the heater hose just before and just after that valve. If it is hot in front but just warm after that vale (if equipped) is stuck closed or maybe a vacuum hose fell off of it, etc.
Other than that both heater hoses going into the firewall to the heater core should both be hot. If one if hot and the other just warm, the heater core is clogged, but I doubt that since you said it is new but you should still check. Also, make sure the coolant level is full.
Thursday, December 7th, 2017 AT 5:16 PM