Hey guys i have a 05 f250 king ranch that the heat only blows warm in, last year i flushed out the heater core (not to dirty didn't seem plugged)but that didn't help, it doesn't loose coolant and comes up to temp so I'm curious how do i check the blend door or the electronic temp controls. i bought the Truck with blown head gaskets so i replaced the heads and studded it also moved the oil cooler to the front of the intercooler its now a air to oil cooler. i don't know if it had the problem before i bought it or not, its not unbearable for me but when the wife rides in it i would like for it to be warmer lol. Any help would be appreciated THANKS.