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Old 01-30-2008, 02:06 PM   #1
Ogre
 
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Exclamation HELP No Heat

I have an 06 Long and Tall, 83K on the odometer. I woke up this morning after sleeping in the van last night with a generator powered heater. I started the van up, pulled my thermal curtains down to start defrosting the inside windows because they were frozen. Anyways I let the engine temp get to 180, then I turned the heater/defroster on level one-4, nothing happened. I checked and replaced the blown 30A fuse, thinking that was the problem. I tried the heater again on all fan levels and the only level it worked on was #4. It's also making a strange noise from the blower motor. Is it a possibility that some of the condensation built up on the blower motor/wheel and caused it to freeze?

Has anyone ever experienced this before wand what did you do to remedy it. Any help would be appreciated because i have no real heat in here which makes it difficult to live in it and do my job.
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Old 01-30-2008, 03:15 PM   #2
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Default Re: HELP No Heat

Must be some reason why the 30 amp fuse blew. Others have had problems with the blower motor bearings and lubrication of them. Sounds like you now need to install a new blower motor resistor.
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Old 01-30-2008, 04:33 PM   #3
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Default Re: HELP No Heat

It could be the same issue I had as the symptoms sound familiar. I removed the blower motor and lubed the two bearings in there. It's been working for 2 months now. Its a fairly easy job and took about an hour.

Douglas
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Old 01-30-2008, 04:41 PM   #4
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Default Re: HELP No Heat

Quote:
Originally Posted by Ogre View Post
I tried the heater again on all fan levels and the only level it worked on was #4.
2nd the resistor fix to see if that fixes it first.

http://sprinter-source.com/forum/sho...ight=fan+speed
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Old 01-30-2008, 05:34 PM   #5
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Default Re: HELP No Heat

from the yahoo group:
Heater blower motor High speed only fix.
Posted by: "yahoogroups@bsupply.us" yahoogroups@bsupply.us ggoetz111
Mon Jan 28, 2008 12:41 pm (PST)
Blown resister module causes heater motor to run only on high speed.

The resister module is on the heater fan shroud, just under the hood up
front, left of middle. It is black plastic with 4 wires coming out. A green
a yellow and two of white yellow black mix NOT the one with Red wires.
Disconnect the harness plug, little tabs on each end must be pushed in while
plug is pulled up Then on the RH side there is a tab that you push to the
left this will release and slide the resister module to the left about .
The resister module will now come up (top away from you to clear housing)
and out. The following is from the manual but basically with an OHM meter
set to R1 the needle should deflect far right or show 1 to 5 ohms between
any two terminals, if any two are open circuit (no movement or reading) the
unit is bad. Local Sprinter dealer had one in stock and it cost me 32.00
Wow I have fan and heat now. The repair book lists several other causes for
the motor on high speed only but this is the most likely cause and is the
easiest to check.

Disconnect the Blower Motor Resistor Block harness connector.

Measure the resistance between Blower Motor Resistor Block cavity 2 and
cavity 1.

The approximate resistance should be 1.4 ohms.

Measure the resistance between Blower Motor Resistor Block cavity 2 and
cavity 3.

The approximate resistance should be 0.8 ohms.

Measure the resistance between Blower Motor Resistor Block cavity 2 and
cavity 4.

The approximate resistance should be 1.6 ohms.

Is the resistance as specified for each circuit?

All

Yes ! Replace the Automatic Temperature Control (ATC) in accordance

with the Service Information.

Perform BODY VERIFICATION TEST - VER 1.

No ! Replace the Blower Motor Resistor Block in accordance with the

Service Information.

gggGary

from Wisconsin
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Old 02-04-2008, 03:59 PM   #6
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Default Re: HELP No Heat

Hey guys, sorry for not responding sooner. Been busy running across the US, making deliveries. I had to order the part from Stoops Freightliner in Indi, as they seemed like the only ones able to get it. Anyways I picked up the part this morning and just installed it. Guess what it solved the problem and it was cheap too. I just wanted to thank ya'll for diagnosing the problem and saving me a couple of hundred $$ in dealer service fees.
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Old 10-30-2008, 05:22 AM   #7
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Exclamation Re: HELP No Heat

Greetings,

Have an 06 Sprinter with 70K. Fan speed resistor went bad! I actually took the resistor apart to see what may have caused the problem. Seems that even though it is covered in a hard ceramic material, it develops cracks allowing for moisture to migrate down to the resistance wire wrapped on the substrate. This causes the internal resistance wire to degrade, get brittle and eventually fracture. The amount of corrosion on the actual wire inside was astonishing under the microscope. My resistor did not actually burn out, it just broke internally. I can say that this does seem like a design flaw. It should be re-designed to be much much more reliable. I think I'll build my own resistor that will work for the life of the vehicle. Because @ approx. 70K lifespan and a million+ miles of projected use of my van, I'll have to spend about $500 to keep the fan running on MB resistors over the lifetime. Seems very unreasonable to me.

Any other vehicle I have owned, I have never had a resistor break down so soon! Love the Toyota....

In the same month my auxiliary heater also does not work.
My radio sometimes stays on after the key is removed, killing my battery if not used for a couple of days.
So far, I am distressed by the surprisingly random electrical gremlins I am encountering on my first Sprinter at such low miles.

Are these common problems?

Luckwoodhaveit
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Old 10-30-2008, 02:08 PM   #8
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Default Re: HELP No Heat

Quote:
Originally Posted by luckwoodhaveit View Post
Have an 06 Sprinter with 70K. Fan speed resistor went bad! I actually took the resistor apart to see what may have caused the problem.
Interesting. Any idea on the number of resistors, values, and wattages? Maybe I'll check on mine.

Quote:
Originally Posted by luckwoodhaveit View Post
In the same month my auxiliary heater also does not work.
My radio sometimes stays on after the key is removed, killing my battery if not used for a couple of days.
So far, I am distressed by the surprisingly random electrical gremlins I am encountering on my first Sprinter at such low miles.

Are these common problems?
The resistor sound like a common problem. The aux heater needs to run at least once every month. Kind of like your A/C system. For the radio, it's a common symptom. It would stay on for no particular reason, but I removed it for something else before I figured out why it was doing it.

So far everything works on mine, but I only have 30k miles.
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Old 10-31-2008, 02:26 AM   #9
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Default Re: HELP No Heat

My 2005's radio also stays on (but rarely)... so i have developed the habit of listening/watching to make sure it does go off.

Thanks for the heads-up on the resistor.

good luck
--dick
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Old 11-14-2008, 01:26 AM   #10
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Default Re: HELP No Heat

I just noticed yesterday that my fan didn't seem to work on the two lowest positions. 3 and high seemed fine. Today before shutting down the engine I left the fan in low and popped the hood. I reached in the area of the squirrel cage, felt no air movement and found the fan wasn't turning. Same deal on the next speed up. 3rd speed I could tell by the noise the fan was spinning. Needless to say I'm going to replace the resistor assembly.

I wish I still had access to all those Ohmite wire wound power resistors we never used after solid state became entrenched. I could probably patch a few in and have them last forever.

I guess the info here is that for me the lower two speeds failed first. If you notice the lower speeds of your fan not working it's a warning. It's most likely time for a new fan resistor pack. Hope this helps.
Quote:
Originally Posted by luckwoodhaveit View Post
Greetings,

Have an 06 Sprinter with 70K. Fan speed resistor went bad! I actually took the resistor apart to see what may have caused the problem. Seems that even though it is covered in a hard ceramic material, it develops cracks allowing for moisture to migrate down to the resistance wire wrapped on the substrate. This causes the internal resistance wire to degrade, get brittle and eventually fracture. The amount of corrosion on the actual wire inside was astonishing under the microscope. My resistor did not actually burn out, it just broke internally. I can say that this does seem like a design flaw. It should be re-designed to be much much more reliable. I think I'll build my own resistor that will work for the life of the vehicle. Because @ approx. 70K lifespan and a million+ miles of projected use of my van, I'll have to spend about $500 to keep the fan running on MB resistors over the lifetime. Seems very unreasonable to me.

Any other vehicle I have owned, I have never had a resistor break down so soon! Love the Toyota....

In the same month my auxiliary heater also does not work.
My radio sometimes stays on after the key is removed, killing my battery if not used for a couple of days.
So far, I am distressed by the surprisingly random electrical gremlins I am encountering on my first Sprinter at such low miles.

Are these common problems?

Luckwoodhaveit
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