Question about Ford F-250
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Posted on Jan 02, 2017
SOURCE: Wrangler jeep heater/AC fan
Usually, when the fan works only on high speed the issue is with the blower motor resistor. It will be located under the dash close to the blower motor itself. It will have a multi-wire plug and feeds signal to the blower motor. An updated resistor maybe available in which case a slightly larger hole will have to be cut for the new resistor. This is not a difficult proceedure, only a couple of screws are holding the resistor in place and most resistors are resonably priced. I recommend you buy the resistor at the dealer, this is a case where you get what you pay for.
Good luck, hope this helps.
Posted on Jan 18, 2009
SOURCE: 04 stratus blower not working
You might have an interconnection problem. I hate these problems, they can be really tough. I had something similar that turned out to be a bad ground connection, but you said that "Relay in box under hood is good and has 12.5 volts going to 1 post"... well OK, good, but then you said "switched the Relays around and everything else worked fine"... well OK, but if it didn't work fine before, you may have a bad relay or maybe a bad connection, so swap them back and see what happens to help isolate the problem. You also said "Ran hot to fan and it works", well in that case, it's not a ground connection at the fan, but still could be further back. It could be bad relay. Good luck to you on that one... as I said... I really hate these kinds of problems. Try to get hold of a wiring diagram if you haven't already. This problem is going to take some patience, but you’ll find it.
Posted on Jun 09, 2009
the fan control balast (or speed controler) is burned out. by design if it only goes high, its junk. replace it and youll have it fixed. should be by the fan under the dash on the passenger side.
Posted on Nov 15, 2009
SOURCE: no blower for heat or
This is a ground side controlled system. Meaning the switches control the ground side of the circuit or power is supplied to the blower motor at all times. The speed select switch provides the path to ground, it does not supply power to the blower motor.
You'll want to check for power on the orange with red wire at the blower motor. There should be power there with the key on and the mode selector in any position except off. If there isn't power there than check the blower motor relay.
The blower motor relay will be in the engine compartment fuse box. Remove it. There should be power on two pins and ground on two pins with the key on and the mode selector in any position except off. You can also try swapping the relay with another of the same part number.
If there is power to the blower motor unplug the connector and see if the orange with black wire has ground. you can do this with a test light hooked to power. The test light should illuminate with the blower switch in any position.
If the blower has power and ground than the blower may be your problem. Plug it back in and whack the bottom of the blower with the handle of a screwdriver. if it starts working you definitely need a blower motor.
Posted on Oct 19, 2010
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