Looks like there are several common complaints about the cooling system and heaters in these models. That said, I would start by checking at the relay(s) that control the fans. From what I see, there are a few different designs and components based on engine size. Can you provide more details about the model and engine? I am attaching a couple of diagrams for now. Does the following look like your under hood panel?
Radiator fan or AC fan ?
SOURCE: Fan motor works on high
Really common problem on Fords. My '00 vic had it and my friends 06 mustang had it. The problem is the blower motor gets old and starts drawing too much amperage. The motor is controlled by (on manual HVAC systems) by a nichrome resistor bank located near the heater core. The extra amperage blows the thermo-resistor in the bank, and also does some damage to the corresponding harness. The reason it work's on "HIGH" is because that setting bypasses the bank completely. You can fix the problem pretty easily yourself but it is sort of annoying. First go get a new blower motor, either from Ford or some other place like Napa or autozone. Probably one of the latter because sometimes it seems dealer's aren't always the most cost effective solutions =] Now head on down to Ford and pick up the resistor bank (and most likely the harness, but check if it's burnt first) park your car, let it cool down, and pull off the radiator cap, keeping it on the hole (this keeps the pressure equal, and just set it on the hole so no random stuff gets in) pull off the coolant lines to the heator core, unbolt the resistor bank, set it next to the next new one, and wire up the new harness one wire at a time. plug in the new one, bolt it in, and reinstall the coolant lines. then put in the new blower motor, it should be on the lower passanger side on the engine bay. Now go enjoy your new fan speeds!
SOURCE: blower fan stops on lower speeds 2000 grand marquis
There is a blower realy. Which steps the voltage up or down. If it fails it will run 12 volts or HIGH speed only... Replace that and your good.
SOURCE: 2000 grand marquis blower fan stops on lower speeds
there is a resistor for the fan motor which works the lower speeds, you need to replace that, it is normally located near the blower motor, got 3-6 wires plugged in it
SOURCE: 2000 silverado a/c only works on high fan speed.
Hi! The blower resistor is the culprit here,located on passenger side of vehicle under glove box area. I have replaced several of these for the same problem. You also need to check the connector for the resistor for heat damage to terminals and replace as needed. The harness will come with wiring attatched and heat shrink **** splice sleeves. hope you find this information useful!
SOURCE: blower motor for interior fan only blows on high
The blower resistor pack needs to be replaced, it's common for the blower speed resistors to burn up and will need to be replaced. It's easier to replace with the glove box out of the way. gmparts direct has the harness and resistor as a package deal. Their part number is PK15218254.
GM Parts list:
Resistor - p/n 15218254 $8.59*
Connector - p/n 15306069 $30.70*
Wiring harness - p/n 89019124 $20 *
You don't need to remove the glove box, just lay on the floorboard and
look up under the dash. There's a 4-wire harness plugged into the
resistor assembly (white plastic), in the bottom of the black heater blower
shroud. Unplug the harness, remove two small screws, and pull down to
remove the resistor assembly.
Good luck and merry xmass.
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