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Ok, so the heat is working at high rpm's but little idle heat. According to the workshop manual I'm suppose to fix circuit 30-FA74A because I have no voltage to the auxiliary pump relay. I'm kind of hesitant about even opening up my fuse box to look at the wires behind it and pretty sure I...

Genius! I found that the connection from the upper radiator hose to the DCCV was swapped and hooked onto the side of the aux pump. I let the car warm up for 15 min and got no heat and then took it for a 20min drive. Heat came on when I hit about 60 and stayed good in idle too. I'll have to check...

Hello, I'm trying to fix my 2002 LS v8 which currently has no heat/defrost but has a working A/C. The heater core hoses are not getting hot. I watched "ericthecarguys" vid on youtube to purge the air, also using the heater bleed but still cant get heat. I've ran some test's and replaced parts...