Only get fan speed 3. NOT high

Only get fan speed 3. NOT high

Postby Bread Van [OP] » March 21st 2010, 11:28pm

So, I've read through about 15 threads on blower motors and resistors, but can't seem to determine the cause of my problem, fan speed 3 only.

My resistor does look dirty and nasty, so I'm guessing that is the problem. But, my fan works on speed 3 and not on speed 4 (high)...most posts indicate that I should have speed 4 only???? The plug also has a burnt connection, the big orange wire on the outside (passenger side) main positive is my guess.

If I was a bettin' man, I'd bet on the resistor and some "cold solders", even though I don't know what those are. I'm probably headed to a pick a part tomorrow, so I'll be looking for resistors...in the meantime. Any thoughts on the speed 3 only problem?
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Re: Only get fan speed 3. NOT high

Postby sufferee » March 22nd 2010, 12:39am

i'd grab the switch(selector) as well.
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Re: Only get fan speed 3. NOT high

Postby kennyj » March 22nd 2010, 12:56am

Hi,
The low speeds of the blower motor are controlled by the blower switch and the resistor pack and current is supplied by a 20 amp fuse in the under dash fuse panel. The High blower setting actuates a relay which supplies full current to the blower from a separate 30 amp fuse which is in the underhood fuse box. Check the 'High Blower' or 'Max A/C' fuse in the underhood fuse-relay center.
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Re: Only get fan speed 3. NOT high

Postby Bread Van [OP] » March 22nd 2010, 4:26pm

The low settings don't work either. ONLY the third position works. Based on what I am reading, seems most likely to be the switch.
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Re: Only get fan speed 3. NOT high

Postby rev_les » March 22nd 2010, 5:09pm

Bread Van wrote:The low settings don't work either. ONLY the third position works. Based on what I am reading, seems most likely to be the switch.

yes, it does sound like the switch, I'd try replacing it at this point and cleaning the connector for the high and see how she does.
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Re: Only get fan speed 3. NOT high

Postby kennyj » March 22nd 2010, 6:50pm

Ok, sorry, I misread the symptoms you're having. Do you have a voltmeter? It's pretty easy to test the fan switch. Also what year is the van?
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Re: Only get fan speed 3. NOT high

Postby Bread Van [OP] » March 29th 2010, 5:19pm

Van is a 2003 (in my profile).

Still haven't picked up a voltmeter...didn't find any of the newer HVAC units in the bone yard.

Will have to keep looking for now. Anyone have a link or information about a test procedure I can use once I get my voltmeter?
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Re: Only get fan speed 3. NOT high

Postby kennyj » March 29th 2010, 11:33pm

Bread Van wrote:Van is a 2003 (in my profile).

Still haven't picked up a voltmeter...didn't find any of the newer HVAC units in the bone yard.

Will have to keep looking for now. Anyone have a link or information about a test procedure I can use once I get my voltmeter?

You don't necessarily need a voltmeter, you could check this with a 12v test lamp. Pull the blower resistor/relay and inspect it, if it's cracked, burnt, broken, it will need to be replaced. Pull the harness connector off the blower resistor. Test for positive voltage from the blower switch at the following wires (ignition on): yellow is fan speed low, tan is fan speed 2, light blue is fan speed 3, orange is fan high. If those voltages check out, your blower switch is okay. There is a red wire to that connector that should be hot all the time, it is the feed for high blower, and is fed by a 30 amp fuse in the underhood fuse/relay center. The black wire in the connector is ground. Plug the harness back into the blower resistor and unplug the 2 wire connector to the blower motor. Test for voltage across the 2 wires in different fan settings. If any don't work, the blower resistor is bad.
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Re: Only get fan speed 3. NOT high

Postby Bread Van [OP] » March 30th 2010, 12:00am

:goodpost:

That's what I'm talkin' about!

Thanks a million
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Re: Only get fan speed 3. NOT high

Postby Bread Van [OP] » April 19th 2010, 12:56am

This wound up being a resistor pack issue. I ordered a new one from RockAuto. It was a Delco unit, but the actual piece looked quite different from what was in my van. I also needed to remove 4 plastic posts (that appear to be designed to protect solder joints) before it would fit in my fan housing. I managed to get it in reasonably well, but I don't think the seal is perfect. You would think a Delco part would fit perfectly right? Anyway the part was $38, and now all speeds are functioning...which is nice!
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Re: Only get fan speed 3. NOT high

Postby astroturf » April 19th 2010, 1:02am

Bread Van wrote:This wound up being a resistor pack issue. I ordered a new one from RockAuto. It was a Delco unit, but the actual piece looked quite different from what was in my van. I also needed to remove 4 plastic posts (that appear to be designed to protect solder joints) before it would fit in my fan housing. I managed to get it in reasonably well, but I don't think the seal is perfect. You would think a Delco part would fit perfectly right? Anyway the part was $38, and now all speeds are functioning...which is nice!


Would this have helped?

AstroSafariBlowerResistor_EN.pdf


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Re: Only get fan speed 3. NOT high

Postby kennyj » April 19th 2010, 1:58am

astroturf wrote:
Bread Van wrote:This wound up being a resistor pack issue. I ordered a new one from RockAuto. It was a Delco unit, but the actual piece looked quite different from what was in my van. I also needed to remove 4 plastic posts (that appear to be designed to protect solder joints) before it would fit in my fan housing. I managed to get it in reasonably well, but I don't think the seal is perfect. You would think a Delco part would fit perfectly right? Anyway the part was $38, and now all speeds are functioning...which is nice!


Would this have helped?

AstroSafariBlowerResistor_EN.pdf


Jim

Good find Jim, will have to remember that. Nice of GM to supply an oem part that's designed not to fit. :think: I had one of those old style ones in the Buick that had literally blown to pieces, it had had water leaking onto it. At least the newer design appears a lot more robust.
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Re: Only get fan speed 3. NOT high

Postby Bread Van [OP] » April 20th 2010, 8:50pm

astroturf wrote:Would this have helped?
AstroSafariBlowerResistor_EN.pdf


Jim


Yes, it would have helped. Those pics perfectly illustrate the difference in the parts. You can see one of the plastic posts I cut off protruding above the actual resistor (new part). I did not modify my housing. Honestly it would have been tough to work/see what I need to see to work. I just carefully cut off the posts with utility knife and carefully :lol: wedged the new part into the housing. The seal seems good, although I can't see very well and I can assume the seal isn't perfect.

One other difference. See the title of my thread. My fan was dead on speeds 1,2 and 4. The only functional speed was 3? It all works for now. If I have to do it again or I find myself in need of a little project, I'll try the prescribed method and alter the housing.
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Re: Only get fan speed 3. NOT high

Postby astroturf » April 20th 2010, 9:19pm

Hey Bread, Sorry I was late to the party. Jim
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Re: Only get fan speed 3. NOT high

Postby Bread Van [OP] » April 20th 2010, 10:15pm

astroturf wrote:Hey Bread, Sorry I was late to the party. Jim


Not that big of a deal, I thought about trimming the housing, but decided my approach was easier. I also figured a correct fitting part was available, but I just had the wrong thing.

So the most helpful element would have been knowing that the part was supposed to be different. I fumbled around for awhile seeing if I could make it fit...then wondering if I should try to return it for a proper part. After I scraped the thing up a bit, I figured the return option was passed and I made it fit.
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Re: Only get fan speed 3. NOT high

Postby Acesneights1 » September 6th 2012, 3:49pm

I realize this is an old thread but I just joined up today and this is exactly my problem so this will be very helpful. I will post my findings later and wanted to say thanks.
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Re: Only get fan speed 3. NOT high

Postby Acesneights1 » September 7th 2012, 11:50am

LooKed last last night. The larger red wire on the plug, that terminal is burned. Looks like I'm on the right track. The dealer wants 60$ for the resistor but even more outrageous was 69$ for a new plug. Got the plug and resistor in acdelco from rockauto for 62$.I will post pics when the parts come.
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Re: Only get fan speed 3. NOT high

Postby Bread Van [OP] » September 11th 2012, 5:47pm

For what it's worth, my new resistor is still working perfectly and i have not gone back to change any part of the install. Do what you can to seal up the new part.
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Re: Only get fan speed 3. NOT high

Postby DaMenaCe » July 2nd 2016, 8:51am

Hey Guys,

i am having a same exact issue.

it started with, fuse blowing when using break, hazard or turn signals.

Did a quick check of a relay using multimeter and a bench power supply, the relay was clicking.

So, i moved forward with replacing the switch itself. (what a pain in the neck)

However, I got the fuse to stop blowing, and my Hazards are working but, no turn signal.

i have read few threads where people are talking about swapping the Emergency flasher relay with the Turn signal relay but i am not sure if there is more than one replay ...

i have a 2005 Astro, passanger.

Please Help...

Thanks,

Dennis.
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