Guests - If You want access to member only forums on HSO. You will gain access only when you Sign-in or Sign-Up on HotSpotOutdoors.

It's easy - LOOK UPPER right menu.

  • Announcements

    • Rick

      Members Only Fluid Forum View   08/08/2017

      Fluid forum view allows members only to get right to the meat of this community; the topics. You can toggle between your preferred forum view just below to the left on the main forum entrance. You will see three icons. Try them out and see what you prefer.   Fluid view allows you, if you are a signed up member, to see the newest topic posts in either all forums (select none or all) or in just your favorite forums (select the ones you want to see when you come to Fishing Minnesota). It keeps and in real time with respect to Topic posts and lets YOU SELECT YOUR FAVORITE FORUMS. It can make things fun and easy. This is especially true for less experienced visitors raised on social media. If you, as a members want more specific topics, you can even select a single forum to view. Let us take a look at fluid view in action. We will then break it down and explain how it works in more detail.   The video shows the topic list and the forum filter box. As you can see, it is easy to change the topic list by changing the selected forums. This view replaces the traditional list of categories and forums.   Of course, members only can change the view to better suit your way of browsing.   You will notice a “grid” option. We have moved the grid forum theme setting into the main forum settings. This makes it an option for members only to choose. This screenshot also shows the removal of the forum breadcrumb in fluid view mode. Fluid view remembers your last forum selection so you don’t lose your place when you go back to the listing. The benefit of this feature is easy to see. It removes a potential barrier of entry for members only. It puts the spotlight on topics themselves, and not the hierarchical forum structure. You as a member will enjoy viewing many forums at once and switching between them without leaving the page. We hope that fluid view, the new functionality is an asset that you enjoy .
Sign in to follow this  
Jeremy airjer W

Diagnosing Blower Motor Problems

Recommended Posts

I wrote this up back in January and finally got around to moving it to the auto forum. This should help if you ever run into this problem.

The diagram is generic and loosely based on GM's setup and more specifically a Silverado. Most manufacturers have a similar setup and the only major differences would be a ground side control (instead of the switch supplying power to the resistor it would be grounding the power from the resistor if this is the case you test light would need to be connected to power to test the switch) and late model Chrysler minivans (they use a module that looks for a difference in a/c voltage from the switch)

If the blower works on high only than likely the resistor assembly is the culprit since power to the blower essentially bypasses all of the resistors and/or the resistor assembly entirely. The reason why none off the other speeds will work is that the resistor or the circuit for the speed four setting has burned out. The lower the setting the more resistance you need to drop the voltage to the blower. The first speed setting requires all four resistors to drop the voltage enough to turn the blower at its slowest speed. Speed 2 needs to turn the blower a little faster so it uses three resistors. Speed 3 uses two resistors and speed 4 uses one.

In some cases the fan will work on high and speed setting 4. The likely cause for this is the speed 3 resistor or circuit has burned out. Speed 4 still works because it doesn't use the lower speeds resistors to control the speed of the blower. If the speed 2 resistor burns out than speed 1 and 2 will not work but 3, 4 and high will continue to work. If the speed 1 resistor burns out than speeds 2, 3, 4, and high will continue to work.

This leads us to how do we know if its the resistor or the switch or the blower. If the blower works on high than we know the blower works. That leaves us with either the switch or the resistor assembly (there are many other possibilities) wich can be easily tested with a test light (or a voltmeter if you choose) The first thing to do is locate the resistor assemble. They can be behind the glove box, under the dash close to the blower motor or under the hood, again usually close to the blower motor. It will typically have 5 to six wires going to it. We'll start by unplugging the connector, turning the key on and connecting your test light to ground.

1.Turn the switch to high and backprope all the wires. Two of them should illuminate the test light. In the diagram below this would be wire E & F. If you don't have a digram then hold the test light on one of the two wires and move the switch to another speed setting. the wire that continuously illuminates the test light regardless of the switch position will be the constant power for high blower speed and will not need to be rechecked in the following steps.

2. Turn the switch to the next lowest setting. Backprobe the remaining wires to see if one of them illuminates the test light. Repeat until you have checked all of the speed settings.

3. If the test light has illuminated a different wire for each setting then we can reasonably assume that the switch is functioning as intended and the source of the problem is the blower resistor.

4. If you find one or more settings (but not all the settings) on the switch that does not illuminate the test light on any wire than we can reasonably assume that the switch has failed.

There are a few other things that can cause blower motors not to work as intended. The switch or the resistor assembly are the two most common problems.

resistordiagram-1.jpg

Share this post


Link to post
Share on other sites

I installed a new resistor (98 plymouth breeze) and it cured the problem for approx 10 minutes and now the fan only works on high again. I assume that the blower motor is pulling too much load and this caused the resistor to burn out again? Or is it possible I got a "bad" new resistor? Thanks in advance.

CnE

Share this post


Link to post
Share on other sites

The breeze is a ground side control systym. This means that the power goes through the blower first. The resistors and the switch are on the ground side. The only current that the resistor sees is what is necessary to get through the resistor. Its hard to explain in words.

This is a tuff call. If the part was O.E. I would be a little concerned that there may be another problem. If it where aftermarket I would lean towards it possibly being defective. If it where a customers car I wouldn't have any problem trying another.

Share this post


Link to post
Share on other sites

Go figure, I read this post yesterday and after work, my blower motor is not blowing on any speed. It has to happen on one of the coldest days.

I have a Linc. Town car as my shooter and it has auto temp control. I figured it was a blower motor or the ATC head. Well a little Cub parking lot diag. and I got it fixed for now. I searched and found the elec. motor housing cover for the blower motor and banged on it once with a quick square I had in my trunk. Started blowing right away! At least I know it’s a blower motor and not ATC head. Plus the blower motor is located under the hood by the fire wall and is very easy to get at. Some are behind the glove box area.

Had to share this, because I have not had a blower motor go out in one of my Veh. in many years, but after reading this thread and with in minutes, mine was failed.

Also figure I would share this , because it could get you some heat for the ride home from work and help a person figure out what is wrong. Just give the blower motor a rap and it will buy you some time. What happens is the brush's stick because or wear or somthing. The bang free's them up for a short period of time, before they stick again, that or something sticking inside of the blower motor. The blower motor will have to be replaced as soon as you can.

Good luck!!!

Share this post


Link to post
Share on other sites

LOL, Glad I could help!!!! \:D

Good point about tapping on the blower if it does not work at all. There have been many blower motors diagnosed with a good tap by this guy!!

Another thing I was going to mention is that If any of you are looking for diagrams or specific repair info head to your local library. Many libraries offer ALLDATA for free. ALLDATA is on of the two (Mitchell is the other) main automotive resources for independent shops.

Share this post


Link to post
Share on other sites
Guest
This topic is now closed to further replies.
Sign in to follow this  



  • Posts

    • My buddy does the same always revs the four wheeler up before he leaves. On his sits he would have someone else drive him in bait while he gets in the stand they rev the four wheeler and take off. Dinner bell come and get it
    • No clue yet somewhere with a cheap motel and some public land
    • Who's ready for the season? Cant wait!
    • After a while we only started hunting evening because we never had any come in the AM. We also started making a bit of noise when baiting (rattling cans) when we had two Bears working. They started coming in right after we baited so the bait, after noon and stay behind hunter seemed to work pretty well.
    • sorta helps, I'll find it...  thanks... me and google just got it.....     have to go see!!
    • Hall of Fame? You must be joking...... Every player starts out like that. No one starts out with a 23 m dollar contract. He still averaged about 15 million per year for his career, that average probably goes up if he plays past 2018. I think he will be ok.
    • Joe was also the 74th highest paid player the year he won the MVP. You may say he is over paid now but he was underpaid 1st half of his career. @Bobby Bass   I don't think Joe is a future Hall of Famer, not even close to borderline but a great player none the less. I think if the Twins would have made a deeper playoff runs back when Morneau was healthy and Santana was Cy-young would have helped. But Joes playoff numbers are terrible. I could maybe see HOF if he would have stayed at catcher his entire career though..... But he will more than likely end up winning a gold glove at 2 positions, and with one being catcher that is pretty elite.
    • Big Dave most if not all pro contracts are paying you for what you have already done with the hope that you will continue to produce. Looking at todays contract Joe's is not to out of line for a future Hall of Famer
    • Great! He is finally earning a contract close to what he is being paid. 
    • thx.  directions are on the site below. just across river from college    http://www.munsingerclemens.com/the-gardens/munsinger-gardens 2 areas, up top and down by river
  • Our Sponsors