2JZGTTELEX

I would first open the hood and check to see if they bypassed the heater hose after the swap. Next, I would check any venting tubes that might be clogged. Then, I would make sure the climate control module works. If the climate control module works, the vents should blow air out. If there is no hot air, you know your blower motor is working but your Heater Core took a dump. Rip the dash out and replace the Heater Core.

I've done 3 Heater Cores just this week... Pertaining to V8 and V12 Jaguars.

UR2klose

iTrader: (3)

im having issues with my heat too. mine somewhat works though. when i 1st start my car it will get warm but then after driving for a while it will start blowing out cool air.. i hope its not the heater core. i would hate to have to pull my dash out

FuMoFFuTT

iTrader: (2)

Hmm.. see if there are any hoses that are disconnected. I worked on my car one time and accidentally unplugged one of the hoses for my heater..