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Radiator fan bypass test

 
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Old 11 Sep 2017, 02:18 pm
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Default Radiator fan bypass test

Hi everyone

I have a year 2k PT Cruiser 2.0 & have been having radiator fan trouble at idle speeds in traffic. Fan doesn’t come on so fluids boil.
There is no fluid loss, I’ve also tested the relays/fuses and they are fine and have just done a bypass check on the connection from the radiator fan.
On mine the connector consists of three terminals, central terminal wire is black (ground) and on each side there is a blue wire (presumably ‘speed 1’ & ‘speed 2’?).

So, standing in front of the engine, looking down, I’ve tested the right side blue wire which makes the fan run okay, smooth and perfectly sounding.

Testing the blue wire on the left hand side does not operate the fan.
Is this okay, should the fan run whichever blue wire I tested?

Last edited by Art4Art1; 11 Sep 2017 at 02:35 pm.
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Old 11 Sep 2017, 03:13 pm
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Default Re: Radiator fan bypass test

both non black wires are low speeds.

low + low = high

think 2 sets of brushes touching the motors armature. two brushes low, 4 brushes high


some relays test fine and don't work. -> the fan is a normal problem though
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Last edited by rob302; 11 Sep 2017 at 03:14 pm. Reason: tree'd all the old folk :P
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Old 11 Sep 2017, 03:24 pm
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Default Re: Radiator fan bypass test

Thanks Rob302

I tested both blue wires, so the fan only runs on the right side blue wire when tested, but when tested on the left side blue wire, fan didn't run at all.

So if I tested both blue wires separately the fan should have run on either wire test?

Last edited by Art4Art1; 11 Sep 2017 at 03:28 pm.
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Old 11 Sep 2017, 07:02 pm
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Default Re: Radiator fan bypass test

Both should run it as low, both at the same time should be high.... For sure.

Alternate method is a bi-directional scanner that can turn on the low and high speed while you verify operation. Shops have these and it makes it soooooo easy it's stupid
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Last edited by rob302; 11 Sep 2017 at 07:36 pm.
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Old 12 Sep 2017, 06:34 am
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Default Re: Radiator fan bypass test

thanks again Rob302

Am on a very low budget, to be honest the cost of a probe/scanner etc would be worth more than the car itself! I would be struggling even if I have to get a new radiator fan at a cost of 80 new)

I tried the bypass test again (direct from battery) on each blue lead and even on both blue leads at the same time.

It only runs on the right hand side blue lead in the connector


does this mean I need a new radiator fan because it is not running off both leads when I test it?

Just need a yes or no on this problem

Last edited by Art4Art1; 12 Sep 2017 at 06:36 am.
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Old 12 Sep 2017, 07:27 am
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Default Re: Radiator fan bypass test

Quote:
Originally Posted by Art4Art1 View Post
does this mean I need a new radiator fan?

Just need a yes or no on this problem
Yes..

Quote:
Originally Posted by Art4Art1 View Post
Am on a very low budget. I would be struggling even if I have to get a new radiator fan at a cost of 80 new)

I tried the bypass test again (direct from battery) on each blue lead and even on both blue leads at the same time.

It only runs on the right hand side blue lead in the connector
..or you could swap the two blue wires around in the connector. Low speed will work then. might buy you some time. you won't have high speed so it'll overheat if you use the AC, but i would do this if i were low on funds and needed to drive to work for a while
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Last edited by rob302; 12 Sep 2017 at 09:14 am.
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