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I have a 1998 ford f150 that heater and air wont work on. I have replaced resistor and all fuses are good. Blower motor works when directly checked with jumper cables. Also blower speed wont change. A

I have a 1998 ford f150 that heater and air wont work on. I have replaced resistor and all fuses are good. Blower motor works when directly checked with jumper cables. Also blower speed wont change. Any suggestions?

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Sounds like the control module is bad. The old ones worked off vacuum. Pull the module out and check it out.

Posted on Nov 18, 2014


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Posted on Jan 02, 2017

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SOURCE: Air Conditioner blower motor resistor was replaced

Motor is also energized by a relay. check that and also check that the motor itself is good by running a hot lead right to it. I'm sure you already checked the fuse and know the switch is good?

Posted on Jul 20, 2009

  • 308 Answers

SOURCE: 1998 BMW 328i heater/AC blower is not running

You have clean the blower unit , may be its dirty then . and then check the blower resistor unit for malfunction.

Posted on Aug 04, 2009

SOURCE: blower motor does not work

I had the same problem, replace, replace, replace. Check, check and recheck. What I found was the blower motor resistor, located in the blower squirrel cage area, two prongs and a curly wire, was bad. Took the new one back, (it ohmed out okay, continuity ok, all ok!) replaced it with another, and Bingo, problem solved. Frustrating to say the least. After two relays and a blower switch, and test, test and retest. It was a faulty resistor. Made in Mexico. And no guarentee, even though new, it works. Trial and error. Even the dealer parts are Honcho en Mexico. Thanks NAFTA. You gonna make us all welfare babies.

Posted on Sep 28, 2009

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SOURCE: I have 1998 Ford 150, no hot air from heater blower works fine

Usually heater core.

Posted on Oct 26, 2009

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Does it blow the fuse if you unplug the blower motor. The motor might be shorted.

Posted on Jul 08, 2010

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Does the blower run at all when you select heat? Fuse #37 is the fuse for the heater blower - it should be a 30 amp fuse (this is in the fuse panel under the instrument panel.) There is also a heater Blower Relay in the Power Distribution Box in the engine compartment. It is #K14 (or maybe R14.)

Another thing to check is the resistor block for the blower motor. It is located on the bottom of the blower housing, on the passenger side, inside the car, below the instrument panel. You will see a wire harness with 3 or 4 wires going to a plastic connector. If the plastic looks like it's melted, it probably is, and that may be your problem. There will be a screw holding the resistor block in place in the housing. If you can remove the plastic connector, do so, the remove the screw and the resistor block. You can get replacement connectors with pigtail wires attached on the internet. (Google "1998 Contour Blower Motor Resistor Connector" Personally, I like the kit from Dorman carried by several different auto parts suppliers. It gives you a new resistor block along with the new connector.) Check the connection pins on the resistor block. If they are dirty or have melted plastic on them, they need to be cleaned. Use a small wire brush or sandpaper to make sure the blades are "bright metal" clean, then coat them with a good electrical protection-type grease. (The little packets of grease auto parts stores sell for car light bulb sockets work well, or a good dielectric silicone grease is fine.) Once you cut off the old melted connector, solder the new connector pigtails to the ends of the old harness wires and cover the joints with heat shrink tubing.. DO NOT use crimp connectors! You'll wind up with the same problem in a very short time! Put everything back together and see if it works.

I've attached a picture of the resistor block and the connector. I found this at O'Reilly Auto Parts web site:

If you're not comfortable doing this kind of work yourself, find a friend who is, or take it to a good shop (usually a dealer is not what I would call a "good shop".)

Good luck!


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1 Answer

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