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btpassed hi - lo relays, fan turns same speed!?

 
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Old 02 Jul 2013, 01:19 am
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Default btpassed hi - lo relays, fan turns same speed!?

so in continuing with my AC overpressure vent / low cool problem on my gf's '07 vert 84k mi, I decided to manually wire the hi - lo side of the coolant fan to the battery to make sure the fan works.

I removed both relays and jumped pin 87 on the connectors to the battery - the fan came on for both sides BUT sounded like it was running at the same speed for both sides!? I even had my gf put her hand on the front of the radiator to feel for a cfm change and she felt no airflow difference.

The fan was kinda loud but not loud enough to make me think it was operating at a high speed. However, I don't have enough experience with cruisers to know how loud the fans are on high speed vs low.

She's owned this car from new and the coolant fan is factory original. Has anyone run into this? Could this be a sign of a weak / failing fan? The engine temp gauge runs halfway and she's had a history of overheats years ago that was possibly fixed by her dad replacing a temp sensor under the hood (but she doesn't remember)

thanks!
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Old 02 Jul 2013, 06:39 am
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Default Re: btpassed hi - lo relays, fan turns same speed!?

The fan is a common issue on these and you seem to be at about the right mileage for it to fail.
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Old 02 Jul 2013, 06:10 pm
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Default Re: btpassed hi - lo relays, fan turns same speed!?

How does the hi low fan function? I saw photos online of the fan motor's guts and there are four brushes inside the fan motor, a pair for each mode. (2 vcc, 2 ground)

I didn't notice a resistor on the photos I saw and I personally got 12vdc input voltage coming into both relays so my thoughts are low speed supplies voltage to one pair of brushes and hi speed supplies voltage to both pairs of brushes.

Thoughts?
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Old 02 Jul 2013, 06:49 pm
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Default Re: btpassed hi - lo relays, fan turns same speed!?

Not sure but maybe these wil help:



buddyiramae likes this.
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Old 02 Jul 2013, 07:27 pm
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Default Re: btpassed hi - lo relays, fan turns same speed!?

yeah, those are some of the photos I saw.

what I want to know is; does the system send a 12vdc supply to the low side brushes for low speed and 12vdc to low and hi side brushes for high speed

OR

does it send 12vdc to the low side brush for low speed and 12vdc to the hi side for high speed

OR

does it send less than 12vdc to the low side brush for low speed and 12vdc to the hi side for high speed and my fan controller is broken.
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Old 02 Jul 2013, 09:58 pm
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Default Re: btpassed hi - lo relays, fan turns same speed!?

The fan controller is built into the ECM. Don't know about the other questions.
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Old 03 Jul 2013, 05:50 pm
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Default Re: btpassed hi - lo relays, fan turns same speed!?

I want to ask something. When I turn a\c and I can hear the compressor turns on but does not blow any air. When I switch to maximum speed then starts blowing cold air. what is the problem to not work and lower levels? Should I turn on the a\c and immediately starts spinning fan radiator?
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Old 03 Jul 2013, 05:52 pm
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Default Re: btpassed hi - lo relays, fan turns same speed!?

Quote:
Originally Posted by celicata View Post
I want to ask something. When I turn a\c and I can hear the compressor turns on but does not blow any air. When I switch to maximum speed then starts blowing cold air. what is the problem to not work and lower levels? Should I turn on the a\c and immediately starts spinning fan radiator?
Yes, the fan radiator should start spinning the second the compressor turns on.
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Old 03 Jul 2013, 06:42 pm
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Default Re: btpassed hi - lo relays, fan turns same speed!?

Ok thanks for the fast reply, but the fan speed increases as you
move the control to the left from the OFF position. My working only on maximum speed. this probably is another problem maybe ?
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Old 03 Jul 2013, 06:56 pm
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Default Re: btpassed hi - lo relays, fan turns same speed!?

If you have a 2001-2005 cruiser, check fuses #7 and #10 in the fuse block in the interior of the car. If you have a 2006 to present, your out of luck.
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