Check the resistor voltage with a multimeter and see if it’s in a suitable range or not. Engine coolant, a combination of a special fluid and water, circulates through engine cooling chambers and works to cool your engine. i quickly unplugged it and later realized that it was the resistors overheating. One of these is a crackling noise which results from moisture being trapped inside older carbon composition resistors (usually in the plate load position of the circuit). Decreased airflow causes the blower motor resistor to overheat and fail. After running for a minute, the voltage regulator starts to overheat, meaning it burns my finger if I keep it there for more than a second. Now that you know your posistor is bad and causing the AMP OVERHEAT error, there’s two options: either replace the posistor with a good one; or, cut the wires and solder a 306 ohm resistor to them (I didn’t try this, but I assume it would work :D) Assuming you want to replace it: The posistor’s part # is F320121021240-IL, and Pioneer will sell you a new one for $19.25. A resistor of a lower wattage would burn out, higher wattages will work but are more bulky. Heating System Basics. If activating your heater causes your engine to overheat, it's time to take a close look at the system to find minor problems on the verge of escalating into major ones. Back in the day, the resistors were suppose to reduce running voltage to around 9 volts. If the ignition timing is incorrect or if the points gap has lessened due to wear then the coil can be energised for too long and will overheat. Also, in the earlier machines, the two DB resistors were 4.8 ohms each; in the Modular machines, these resistors are 8 ohms each. Well, maybe it gets warm, but that’s it. there should be a link to a manual for you cant somewhere here..it should give you a correct value for your resistor. This type of short circuit can easily cause 500+ amps of current to flow. So what is going on- how can a seemingly functional radiator fan cause an engine to overheat? The larger the resistor is, the more power it can safely dissipate without suffering damage. Small resistors (1/4 watt or less) can overheat just as easily as big ones. Your car's heater is kind of like a miniature radiator. I suspect the 3x capacitors and 2x resistors at the motor died. I have a schematic I made, but did not insert the resistor for the power yet. So let us start at the beginning, by answering the following question. If the rotational velocity of the motor exceeds the synchronous velocity from the VFD, it will act as a generator. Overloaded wires will overheat, causing damage to the wire insulation or causing a fire. Resistors are rated both in terms of their resistance (ohms) and their ability to dissipate heat energy (watts). They blow up on overheating in a way which causes little external heat damage, like fuses; in other words, the surface temperature before it finally fails open will be much lower than with "standard" resistors. Resistor resistance ratings cannot be determined from the physical size of the resistor(s) in question, although approximate power ratings can. Replacement with a carbon or metal film type will cure this. When a resistor overheats, the material begins to melt away, which will cause the resistance to increase (usually), until the resistor breaks. A high current flowing through a battery can cause a rapid rise in temperature, which could result in an explosion with the release of hydrogen gas and electrolytes (an acid or a base) that could burn the tissue and cause blindness or even death. Typical causes are a faulty thermostat, cooling fan, or oven element - if any of these are not fully functioning it may be the cause of your oven's overheating problem. (DB resistors in VFDs are similarly rated). The engine in your Ford vehicle can overheat if it is not supplied with enough coolant. Blower motor fuse blows repeatedly. BUT, by using resistors, you can design your circuit to have the currents and voltages that you want to have in your circuit. A couple of converters depend on a resistor to control the voltage to the 12-volt DC system and the onboard batteries. It might get hot...but it should be fine. This additional strain on the ignition coil may cause voltage overload, leading to overheating and eventually failure. If the coolant is not flowing through your engine, then your Ford engine can (and will) overheat. Overheating causes damage to the circuit components and can cause fire, explosion, and injury. Furthermore, it can be dangerous, especially if you don’t know what you are doing, because you are messing with electricity. Because the purpose of a resistor is to dissipate power in the form of heat, the resistor has a rating (in watts) at which the resistor can continue to dissipate before the temperature overwhelms the resistor and causes it to overheat. This results in the motor to be super hot. well, it did, but within a few seconds, i started to smell something burning. A functional resistor should have a voltage between 3V and 13V. Check the cabin air filter for clogging. This section includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations. 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