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Old 01-30-2012, 03:00 PM
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steering box

Has anyone replaced their steering box on a 04 WJ with the 4.7 and hydrualic cooling fan setup. If so how did you bleed the air out of the fan assembly without a DRB III scan tool. The snap on scan tool I use now doesn't not have that function in it's menu. Is there another way of doing it.

On mitchell's website it says you need to activate the cooling fan solenoid with the scan tool and allow the fluid to go through the assembly while turning the steering wheel back and forth to get the air out. Is there another way of doing it besides using the scan tool?

I would just fill it with fluid and turn the wheel lock to lock really slow, but having the fan to deal with too I don't want to screw that up..


James
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Old 01-30-2012, 03:15 PM
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Re: steering box

I replaced my steering pressure hose (the one from the pump to the fan motor) and I just overfilled it with fluid, left the cap off and went back and forth from lock a few times to bleed air out. Topped it off and went back and forth again to make sure and was good to go. No problems with the fan.
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Old 01-30-2012, 06:57 PM
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Re: steering box

If you just did that hose You didn't take all the fluid out. Being I'm doing the steering box I have to change two hoses anyway and while I have it apart I'm doing a fluid flush.

I'm glad you didn't have any problems, I just hope I don't either..



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Old 01-30-2012, 08:44 PM
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Re: steering box

Just remove the connector of the coolant temperature sensor, located in between the alternator and AC compressor. The lack of temperature info to the PCM, will let the hydraulic cooling fan go to full speed. Just a safety feature.
The cooling fan is in fact always idling at around 500 rpm, which already causes a low hydraulic fluid flow through the hydraulic cooling fan, but with the mentioned connector of, it goes into max speed mode.
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Old 01-31-2012, 10:18 AM
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Re: steering box

Quote:
Originally Posted by Frango100 View Post
Just remove the connector of the coolant temperature sensor, located in between the alternator and AC compressor. The lack of temperature info to the PCM, will let the hydraulic cooling fan go to full speed. Just a safety feature.
The cooling fan is in fact always idling at around 500 rpm, which already causes a low hydraulic fluid flow through the hydraulic cooling fan, but with the mentioned connector of, it goes into max speed mode.
Good to know Frank, that probably would have saved me some time!
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Old 01-31-2012, 06:10 PM
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Re: steering box

Quote:
Originally Posted by Frango100 View Post
Just remove the connector of the coolant temperature sensor, located in between the alternator and AC compressor. The lack of temperature info to the PCM, will let the hydraulic cooling fan go to full speed. Just a safety feature.
The cooling fan is in fact always idling at around 500 rpm, which already causes a low hydraulic fluid flow through the hydraulic cooling fan, but with the mentioned connector of, it goes into max speed mode.
Ok thanks for the heads up. I'm assuming that removing the connector on that will cause a CEL, I can always clear that with my scan tool..

I knew the fan always spun even at idle so I was thinking that would have been enough to bleed it..

Thanks guys


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Old 02-02-2012, 09:30 PM
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Re: steering box

Well guys I replaced my steering box today without a hitch. Much better turning and response. My only concern now is I tried bleeding as much air ut as possible but i don't think I got it all out.

I pulled the coolant temp sensor plug off the sensor and the fan came out full blast, I turned the wells lock to lock a couple of time while reving the engine a little to get the fan spinning faster.

After all was said and done I plugged the sensor back in and cleared the CEL. Then I noticed that the fan wasn't spinning at all.. It will spin once and a while but nothing steady like it used to. If I let it sit in park and rev the engine the fan will start to spin but at a slow speed. I'm thinking I still have air in the system and need to just drive the car. I'm keeping my eye on the temp gague to make sure I don't have a problem.

But before this replacement the fan always spun at about 300-500 rpm. I wonder being that I did a fluid change along with the new steering gear I wonder if this is how it works now with the cleaner fluid..


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Old 02-02-2012, 10:32 PM
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Re: steering box

No, the fan should spin at around 500 rpm in any case, or higher when the engine gets hot. Did you check the fluid for air? In the beginning of the dearation the fluid gets white of all the small air bubbles. You need to take the steering wheel to full stop at least a 20 times (donīt keep it in the full stop position, because it will put a lot of stress on the pump due to the high pressure). Your pump is not making strange noises? Keep an eye on the fluid level, because the pump doesnīt like to run dry. You did use the factory fluid or at least a synthetic one?
Better not to rev the engine when bleeding the system, because in the beginning there is really a lot of air in the system and it mixes with the fluid and becomes a foam, which the pump doesnīt like too much.
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