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How do you repair the temperature control switch on a 1985 F-150 300L 6-cylinder It blows on vent floor-ventmix but NO defrost at all?
Wiki User
∙ 17y ago
the haynes fiero repair manual # 79008 electrical diagram on page 296 shows two small motors that control the flaps which direct air flow to the floor or defrost to the windshield or to the face vents for aircon. my problem is the air only blows to the windshield defrost. All the push buttons work properly and switch voltage to the different wires on the connector, So I suspect the one of the diversion flaps is stuck, or the small flap motor is bad. however the tear down page 126 does not show the 2 flap motors on the ac/heater/blower housing or any detail were they connect to the flap control levers. I think this looks like a major problem to get to these flaps and I just may cut a hole in the bottom of the blower housing to manualy move the flaps by hand to free them up rather than removing the center console and having to remove this large blower housing from under the dash board which connects to hot water heater hoses through the firewall and also the refrigerant R12 hoses through the firewall. Then I will make a plastic cover plate to cover the hole after I free up or move the flaps. I wish I had a professional mechanics drawing for this blower housing unit that would properly show all the parts, which I could print out on my 11x17 printer. wish me luck and I hope this info helps you. From: Johnmason4th@netzero.net I hope this helps you
Wiki User
∙ 17y ago
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What causes the temperature control unit on your GE refrigerator to click non stop?
the clicking you hear is more then likely just a noisy defrost timer..in some ge refrigerators the defrost timer is mounted close to the temp control.
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What do you do when your heat is frozen up?
If this is the condenser that is frozen, you have a problem with the defrost cycle. There are 2 things that need to be checked, the defrost sensor and the defrost control board. More than likely it is the defrost control board that is the problem and of course that is the more costly of the 2.
What is the function of the current sensing relay in an oil safety control scheme?
The electrical control panel for a refrigeration unit using single or three phase power. The control portion has an oil pressure safety switch, defrost timer, temperature controls and perhaps a refrigerant pressure control in conjunction with the normal internal overload circuit breakers for the compressor. After operation of the refrigeration unit for a period of time, a defrost control device cuts off the compressor and turns on the electric defrost heaters. As the evaporator coils are defrosted, defrost thermostats open the defrost heater supply circuits. When the current sensing relay senses that all the defrost heaters have been shut off via the defrost thermostats, a time delay relay will return the refrigeration unit to the normal refrigeration cycle. The same current sensing relay will prevent false triggering by the oil pressure safety switch if the compressor's internal overload circuit breaker opens
How much energy is needed for a heat pump defrost cycle?
About 10% during the outdoor temperature from about 40 degrees to 20 degrees. Not a lot beyond those temperatures that make frost on the outdoor coil...assuming you have a unit with a good electronic defrost control.
Why does your defrost run even when it is in cold position?
The defrost function simply directs air over the inside of you windshield. It's temperature is controlled by the temperature dial on your environmental controls.
How a pressure augmented defrost control is activated?
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Why is it that your car's compressor keeps on running. It stops only if you will shut it off?
More than likely, your H-A/C control is set to Defrost. In most vehicles, when this is set to Defrost, the A/C Compressor runs continually.More than likely, your H-A/C control is set to Defrost. In most vehicles, when this is set to Defrost, the A/C Compressor runs continually.
What typical heat pump defrost termination temperature is?
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Car heater just defrost work?
When you set the control, if you chose defrost, it usually does it at the temperature you specify. So if you want heat only blowing through the windshield vents, which I believe may be the question you are asking, it varies between makes of cars. This is what to look for : defrost, fan speed, temperature. If you mean "Can a car that only has a heater ( no air conditioning ) be used to defrost?" The answer is still yes. I believe the question is missing words. It is comparable to asking "Hand, just finger work?" You might try asking again, being more specific, explaining why it is a problem.
During the defrost cycle of a forced draft low temperature evaporator the evaporator fan would what?
during the defrost cycle of a forced draft low temperature evaporator, the evaporator fan would?
