1999 Tahoe blower fan problems

[Tombigbee]

In the last year.....
My heat/AC blower fan began intermittently stopping, no matter which speed was selected on the switch. Usually it would not come on until I got moving and hit a few street bumps. And, a tap or so on the under-dash plastic housing would almost always get it going.

Then, I lost the high speed setting entirely about 3 months ago, with the other lower fan speeds continuing to work using the above procedure.

A couple of weeks ago, it stopped working altogether, and no amount of banging on it would help.

After reading a lot online, I blew $20.00 today on a new relay, the one next to the resistor block above the housing. I thought it controlled the high speed setting. No change. I did partially remove and examine the resistor block, and visually it looks OK....nothing scorched or burned)

(Interestingly, with all the fooling around under the dash today, it has started working again on the lower speeds only. I'm sure that is only temporary.)

Does getting it to work by banging on it mean the brushes are about shot in the motor?

Can the resistor block have anything to do with the high speed setting?

Can anyone tell me where to go next?

Also, I've gotten conflicting info on the cabin air filter. Does my '99 have one?

Many thanks for any help or direction.

 

[bmwme]

Well first of all you are in the 2007+ section...I'd delete this and post it is the right section you might get more info.

I'd say the bearing in the blower motor is going causing a lot of friction and loss of performance. I had to replace the motor in my Jeep. Either that or a loss contact in the wiring...gl

 

[SunlitComet]

In the last year.....
My heat/AC blower fan began intermittently stopping, no matter which speed was selected on the switch. Usually it would not come on until I got moving and hit a few street bumps. And, a tap or so on the under-dash plastic housing would almost always get it going.

Then, I lost the high speed setting entirely about 3 months ago, with the other lower fan speeds continuing to work using the above procedure.

A couple of weeks ago, it stopped working altogether, and no amount of banging on it would help.

After reading a lot online, I blew $20.00 today on a new relay, the one next to the resistor block above the housing. I thought it controlled the high speed setting. No change. I did partially remove and examine the resistor block, and visually it looks OK....nothing scorched or burned)

(Interestingly, with all the fooling around under the dash today, it has started working again on the lower speeds only. I'm sure that is only temporary.)

Does getting it to work by banging on it mean the brushes are about shot in the motor?

Can the resistor block have anything to do with the high speed setting?

Can anyone tell me where to go next?

Also, I've gotten conflicting info on the cabin air filter. Does my '99 have one?

Many thanks for any help or direction.

Relay bypasses the resistor for direct battery power when engaged. Hence high speed.

Disconnect the power leads on blower and test voltages on different speed settings if you have varied reading but it does not work when plugging them back in your motor then it is most likely dieing.

Your Vehicle: 1999 Chevy Truck K Tahoe 4WD V8-5.7L VIN R Vehicle » Heating and Air Conditioning » Cabin Air Filter » Locations

Notes Locations PASSENGER COMPARTMENT AIR FILTER

This vehicle is not equipped with a factory installed Passenger Compartment Air Filter.

---------- Post added at 02:36 AM ---------- Previous post was at 02:34 AM ----------

Well first of all you are in the 2007+ section...I'd delete this and post it is the right section you might get more info.

Kinda seems like you are in the wrong. No? Seems like the right section to me.

 

[TigerEyz3]

Correct section...

I had a similar issue with my Tahoe.

1. I had to replace the plug behind the switch in the dash - ground wire in the plug was burnt a bit. Got the replacement from a junkyard - $10 for the dash and overhead plugs combined, IIRC.
2. I replaced the blower motor also - figured it wouldn't hurt. Actually did this before I replaced the plug mentioned above.

 

[youknowmyname67]

In the last year.....
My heat/AC blower fan began intermittently stopping, no matter which speed was selected on the switch. Usually it would not come on until I got moving and hit a few street bumps. And, a tap or so on the under-dash plastic housing would almost always get it going.

Then, I lost the high speed setting entirely about 3 months ago, with the other lower fan speeds continuing to work using the above procedure.

A couple of weeks ago, it stopped working altogether, and no amount of banging on it would help.

After reading a lot online, I blew $20.00 today on a new relay, the one next to the resistor block above the housing. I thought it controlled the high speed setting. No change. I did partially remove and examine the resistor block, and visually it looks OK....nothing scorched or burned)

(Interestingly, with all the fooling around under the dash today, it has started working again on the lower speeds only. I'm sure that is only temporary.)

Does getting it to work by banging on it mean the brushes are about shot in the motor?

Can the resistor block have anything to do with the high speed setting?

Can anyone tell me where to go next?

Also, I've gotten conflicting info on the cabin air filter. Does my '99 have one?

Many thanks for any help or direction.

If the fan isnt coming on anymore at all I personally would take the fan out and just wire it up to a plug and see if it powers up if it does now you know you need to work inside the vehicle if it doesnt just replace it

 

[bmwme]

Kinda seems like you are in the wrong. No? Seems like the right section to me.

Well it was obviously moved by the moderator. "Moved: 1999 Tahoe blower fan problems"

I don't spend any time in this section so I wouldn't have seen the thread if it wasn't in the 2007+ section.

Anyway OP, hope you fix your problem.