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Old 11-23-2019, 07:19 PM   #1
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Dash AC keeps blowing fuse

My 2005 Monaco LaPalma (w22 chassis) dash AC has worked, albeit not always the coldest, but blew the fuse a few months ago. We replaced the fuse and it worked for about 50 miles then quit again. Tried another fuse and same problem. I searched the forum and see many many ac threads but did not see this problem. Any ideas?
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Old 11-23-2019, 10:44 PM   #2
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Does it blow the fuse on all the fan speed settings or just the high speed fan setting?
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Old 11-24-2019, 05:48 AM   #3
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Only high, but the AC has only worked on high since we bought it in 2012. Low and medium do nothing whether it is AC, heat, vent, etc.
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Old 11-24-2019, 05:51 AM   #4
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Quote:
Originally Posted by kwberg View Post
My 2005 Monaco LaPalma (w22 chassis) dash AC has worked, albeit not always the coldest, but blew the fuse a few months ago. We replaced the fuse and it worked for about 50 miles then quit again. Tried another fuse and same problem. I searched the forum and see many many ac threads but did not see this problem. Any ideas?
Does it stop blowing air or does it appear that it's not blowing cold air after the fuse burns out? Try running the fan with A/C off & see if it burns out the fuse, perhaps the A/C compressor clutch coil is shorted & burning out the fuse.
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Old 11-24-2019, 05:55 AM   #5
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That sounds like the blower motor resistor/control board is shot or you have a winding shorted in the motor
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Old 11-24-2019, 06:01 AM   #6
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A/C

elec. schmatic
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Old 11-24-2019, 06:50 AM   #7
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dash fan

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That sounds like the blower motor resistor/control board is shot or you have a winding shorted in the motor
You should have a tag/label on you heater box under the front hood, get the model number of the unit & contact the people in the attachment for replacement parts.
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Old 11-24-2019, 07:25 AM   #8
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Dash fan

Another supplier, Comfort Air.
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Old 11-24-2019, 07:39 AM   #9
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3 choices. Blower motor, Compressor, or Compressor clutch. Quick stop at Auto Air Shop will give you the answer you are looking for.

If the blower is working on High you can rule that out. If the compressor clutch is engaging and disengaging you can rule that out.

My money is on no Freon in the system (You "no cooling well") and a bad fan airflow resister. ( that is what changes the fan speeds.) That is located in the Evaporator box in the firewall. It uses the air flow to keep it cool.
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Old 11-25-2019, 06:28 AM   #10
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Thanks for all of the input. Just to clarify on some of the questions above:
The AC works fine for about 50 miles (1 hour) after installing a new fuse. After the fuse is blown, the blower does not work, whether you turn to vent, heater, or AC. The fuse that blows is labeled "dash a/c" in the owner's manual.
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Old 11-25-2019, 06:46 AM   #11
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...just to clarify....there are usually two 12v fuses associated with the dash AC....one is a 10 amp for the compressor clutch and the other is 20-25 amp for the fan motor ….the size of the fuse that is blowing should point you in the right direction.....my guess--it the larger fan fuse so fan motor or resistor pack is the issue.....
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Old 11-25-2019, 06:53 AM   #12
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Quote:
Originally Posted by kwberg View Post
Thanks for all of the input. Just to clarify on some of the questions above:
The AC works fine for about 50 miles (1 hour) after installing a new fuse. After the fuse is blown, the blower does not work, whether you turn to vent, heater, or AC. The fuse that blows is labeled "dash a/c" in the owner's manual.
I think you have your answer. Blower Motor air flow resister. You tube is your friend. Most all A/C systems are the same.
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Old 11-26-2019, 06:09 AM   #13
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This happened to me the first time I used my coach I had to replace the fuse twice. I bought a Freon kit, the gauge indicated it was on the low side. After filling it to the correct amount I have not had any problems since.
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