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My AC/heater fan Does not work on the highest setting

Tiny
JAKE1755
  • MEMBER
  • 1995 PONTIAC BONNEVILLE
  • 208,000 MILES
But does work on the lower settings. Any help appreciated. Thanks! Highest fan setting does not work.
Monday, July 2nd, 2012 AT 10:58 PM

17 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Do you have a multimeter to do some testing? Could be the high speed blower relay.
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Monday, July 2nd, 2012 AT 11:01 PM
Tiny
JAKE1755
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I do have a multimeter. Where is the blower relay located? Thanks
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Monday, July 2nd, 2012 AT 11:09 PM
Tiny
SATURNTECH9
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Do you have auto climate control where you dial in the desired temp?Or a manual ac controls?
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Monday, July 2nd, 2012 AT 11:18 PM
Tiny
JAKE1755
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Manual rotary controls.
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Monday, July 2nd, 2012 AT 11:19 PM
Tiny
SATURNTECH9
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Its labeled N2 in the diagram.
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Monday, July 2nd, 2012 AT 11:29 PM
Tiny
JAKE1755
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I'm not quite sure where under the hood this is. Is it under the fuse/relay panel? Looks like I have 7 relays under the 2 fuse boxes.
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Monday, July 2nd, 2012 AT 11:51 PM
Tiny
SATURNTECH9
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Facing the front of the car along the firewall on the far left side like it shows is the blower relay.
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Monday, July 2nd, 2012 AT 11:55 PM
Tiny
JAKE1755
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Found it. I've got the relay out, is there a way to test it or do I just put in a new relay?
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Tuesday, July 3rd, 2012 AT 12:05 AM
Tiny
SATURNTECH9
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We could test if the relay is working if you had a mulimeter or test. See if any of the other relays are the same as the blower motor?If there are swap it and see if it works on high?
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Tuesday, July 3rd, 2012 AT 12:20 AM
Tiny
JAKE1755
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Swapped relay with no change. I forgot to mention that the air is only coming out of the defrost vent and not through the dash vents, any idea on that one? Thanks for the help.
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Tuesday, July 3rd, 2012 AT 12:35 AM
Tiny
SATURNTECH9
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That would be a seperate issue from the blower motor. Most vacuum operated mode door actuators when they dont get the vacuum they need or leak vacuum default to defrost position for safety. But lets fix one thing at a time here geta multimeter and let me know when you get one so we can do some testing.
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Tuesday, July 3rd, 2012 AT 12:52 AM
Tiny
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I apologize I have to go to work now and will not be able to test until tonight or tomorrow
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Tuesday, July 3rd, 2012 AT 12:57 AM
Tiny
SATURNTECH9
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Alright let me know when your ready.
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Tuesday, July 3rd, 2012 AT 2:03 AM
Tiny
JAKE1755
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Swapped a relay out with another and did not notice a change. It doesn't sound like the compressor is clicking on. The entire ac system was replaced 7 months ago. The air seemed cooler, but now as the weather has really heated up here, it appears just to be blowing warm air. Looks like I missed this up front.
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Wednesday, July 4th, 2012 AT 5:13 PM
Tiny
SATURNTECH9
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Alright now we have 3 different problems lets work on the blower motor first the one we started with. You will need to get a multimeter if you want to trouble shoot it yourself.
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Wednesday, July 4th, 2012 AT 6:46 PM
Tiny
JAKE1755
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Sorry about that, I swapped out the blower motor relay with another and it appears so far that it may have resolved the fan speed issue. ( Haven't purchased a new one just used another from the relay area with the same pinout. The AC issue ofthe compressor not clicking on would probably be the biggest issue at the moment. I really appreciate the help. I know enough to be dangerous, but not quite enough to get to the bottom of things.
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Wednesday, July 4th, 2012 AT 8:02 PM
Tiny
SATURNTECH9
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First thing for the ac is take a pressure reading on the ac system.
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Wednesday, July 4th, 2012 AT 10:15 PM

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