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dash heater dead. F150 2011 (or varied)
first the engine must get hot, fully and stay not and not vary.(much)
this is called a thermostat, and most have a life span of 7 years.
yours is 11 years old. so is due.
run engine until fully hot, 10miles will do it. ,less in summer.
connect any scan tool (real, not lame code readers)
see PID value for ECT, 180 to 200f is normal thermostat temp.
test 1 now complete, it is or it is not at proper temp. steady parked.
not proper it is bad.thermostat , replace it with oEM spec stat.
IS PROPER temp !
the dampers are failing on the dash heater core, we test those next.
or controls to them. On my car I can even remove the damper motors and turn the damper shafts by hand to prove they work or not.
spec 5.0Liter
Starts to open
87.5°C (189.5°F)
Fully open
100°C (212°F)
200f par
use the scan too to see if there is HVAC DTC errors.
or ECT errors. engine too cold etc. (it uses a timer to gauge if it is late reaching proper engine temp.
all heater heat comes from the coolant, you know that fact right?
P0125 (may happen with below)
P0128 <<<<<< bad stat. replace it;
Sometimes when you open cooling system, air gets in, it can cause problems with temp gage.
How hot does it get in degrees F? Is the coolant boiling over? Are you losing coolant? Use a non-contact infra red temp gun to take engine temp, At least we will have a degrees F reading. Most temp gages say hi or lo, cold or hot. I don't know about yours?
Can you check for combustion gases in the coolant?
What about the radiator? Water pump? Can you check for coolant flow? There could be air in the cooling system? Do you trust your temp gage? Are there overheating issues besides the temp gage showing hot, like coolant overflowing, under the hood, somewhere?
You likely have air in the cooling system, and the air bubbles are in the heater core, which takes heat from the coolant and puts it in the cabin air.
I have put a post in about trying to get air out of the cooling system, but essentially, unscrew the 3 screws holding the coolant reservoir down, and lift up the corner that does not have tubes coming out of it so that it is standing on end. That will help get the air bubbles out. Then start the car and let it warm up for 3 to 5 minutes at idle so that the thermostat opens. That should accept a lot of coolant. Then keep adding coolant and standing the reservoir up until it doesn't accept any more.
Do you have access to a non contact laser temp gauge?
If so shoot the thermostat housing and see if the gauge is correct.
If the gauge is off from the laser then replace the engine coolant temp sensor,
If the gauge is correct then double check the thermostat installation,is it in backwards? or maybe you got a bad thermostat.
did you flush the entire system when you replaced water pump?
It will probably be your thermostat that is jammed open , try fitting a new one , the thermostat is located in the housing on the side of the engine usually just above the gearbox , trace the top radiator hose to the engine and you should be able to find where the thermostat is ,
i have 2000 olds intrique i replace the thremostat, now it still over heats when i drive down the road. maybe the water pump? it runs about havw way under the middle line on the temp gage. now it will go over the center line on the temp gage. last thrusday it started to over heat when driving it in the parking lot at school. [email protected]
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