No Heat

njcustom · #1 (**permalink**) 10-19-2011, 12:37 PM

Hello everyone I am having a situation with my 2003 F250. Yesterday I went out to start my truck and let it warm up before taking my daughter to school put the heat on and went back into the house. When we came back out the truck was up to temprature but no heat blowing out the vents. Came back home did some investigating nothing unusual. Flushed out the heater core, coolant lines, replaced the thermostat, as well as checked to make sure the heater control valve in the coolant line to the core is working. All of these are fine any sugestions on what to check on next. The truck is not overheating or anything to lead me to beleive the water pump is bad. It has started getting cold here in Texas and anyones help would be awsome.

**NYC F-350** · #2 (**permalink**) 10-19-2011, 12:43 PM

Blend door or the actuator

njcustom · #3 (**permalink**) 10-20-2011, 05:29 AM

Thanks for the reply i checked both they are fine I noticed when i have the heater control turned to heat the ac compressor is running and it is like the ac system is constantly on any sugestions.

**Term3** · #4 (**permalink**) 10-20-2011, 05:46 AM

Just thinking out loud here. Since the default position for the vents with vacuum loss is the defrost position. I know some cars have the A/C engaged to condense any moisture in the incoming air when the defrost is selected. Not sure if our trucks do the same or if there are some temperature parameters it must meet first. IDK

Cold? What do you Texans consider cold? 50F??? You should try -35.

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