I need some input on my heater problem. I've spent a couple hours today researching on this forum.
Here's the situation: no heat at all.
The thermostat is new and is correctly oriented and installed.
EDIT: I forgot to mention I'm running fan delete on the engine - did the mod to the electric fan switch to have low speed on all the time and high speed to kick in at normal low speed temp for the electric fan.
There is plenty of coolant in the car. I get a steady stream of coolant from the bleed screw, and there are no more bubble showing up in the reservoir.
The temp gage stays just below 1/2 most of the time, but sometimes is slightly lower. It does not go below 1/4, even at speed on the interstate, once warmed up.
The hoses from the thermostat housing area and the head to the firewall are good. I've disconnected them at the firewall, and hot coolant is available there.
I've seen that the heater valve can be an issue, but if it is stuck open, you have heat all the time and the default condition is open. I unplugged the electrical connection at the top of the valve. With the temp control all the way to hot, there's no voltage to the valve. If I turn the knob to cold, I get voltage at the valve. So that appears to be okay. In addition, I can feel movement in there while moving the knob from hot to cold.
Flapper valve is working. You can hear it 'thunk' closed when you move the knob.
While I was looking under the dash at the valve and etc., I did see a sensor of some sort hanging loose. It is metallic, about two inches long, small diameter, and curved. The end is blunt. There's a hole in a plastic part near the heater valve that this goes in. What is this piece, and how should it be oriented for reinsertion? Some posts mention a thermostat in the center console. Could this be associated, and if this isn't working, could that be the cause of no heat?
Finally, could the heater core itself be the root cause of no heat?
I know its almost spring, but the key word is almost. I need heat!! The alternative is to drive my Ford truck every day - low speed, low gas mileage, etc.
TIA for your help on this one.
Here's the situation: no heat at all.
The thermostat is new and is correctly oriented and installed.
EDIT: I forgot to mention I'm running fan delete on the engine - did the mod to the electric fan switch to have low speed on all the time and high speed to kick in at normal low speed temp for the electric fan.
There is plenty of coolant in the car. I get a steady stream of coolant from the bleed screw, and there are no more bubble showing up in the reservoir.
The temp gage stays just below 1/2 most of the time, but sometimes is slightly lower. It does not go below 1/4, even at speed on the interstate, once warmed up.
The hoses from the thermostat housing area and the head to the firewall are good. I've disconnected them at the firewall, and hot coolant is available there.
I've seen that the heater valve can be an issue, but if it is stuck open, you have heat all the time and the default condition is open. I unplugged the electrical connection at the top of the valve. With the temp control all the way to hot, there's no voltage to the valve. If I turn the knob to cold, I get voltage at the valve. So that appears to be okay. In addition, I can feel movement in there while moving the knob from hot to cold.
Flapper valve is working. You can hear it 'thunk' closed when you move the knob.
While I was looking under the dash at the valve and etc., I did see a sensor of some sort hanging loose. It is metallic, about two inches long, small diameter, and curved. The end is blunt. There's a hole in a plastic part near the heater valve that this goes in. What is this piece, and how should it be oriented for reinsertion? Some posts mention a thermostat in the center console. Could this be associated, and if this isn't working, could that be the cause of no heat?
Finally, could the heater core itself be the root cause of no heat?
I know its almost spring, but the key word is almost. I need heat!! The alternative is to drive my Ford truck every day - low speed, low gas mileage, etc.
TIA for your help on this one.
Comment