Cooling Fan Pump Solenoid

rt2barbers said:
How is the HCF pump solenoid (actuator) removed from the pump body?
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No one knows how. I have never seen a write up on any LS websites. Usually the pump is replaced as a fix.

Instead try what I did. Buy a can of Sea Foam Transmission flush, it works for hydraulic systems like power steering and our cooling fans. Drain the fluid from the system and replace it with the Sea Foam. Run the car for at least a half hour. Flush out he Sea Foam with a quart of fresh transmission fluid, refill the system with transmission fluid. I used synthetic.

If this does not work, buy a pump.
 
Did the Sea Foam work for your car?

Also I think the solenoid is the most likely component to fail. I rarely hear of a PS pump failing yet the coolant pumps seem to fail regularly. Yet I too haven't heard of anyone replacing the solenoid. My car overheats whenever I'm stopped in traffic on any day warmer than 70F. Since we are going into winter and I'm rarely in stop and go traffic (only 3 times all summer) I'm waiting until spring before replacing anything but would love to get away with just flushing the system or replacing only the solenoid.




craigh said:
No one knows how. I have never seen a write up on any LS websites. Usually the pump is replaced as a fix.

Instead try what I did. Buy a can of Sea Foam Transmission flush, it works for hydraulic systems like power steering and our cooling fans. Drain the fluid from the system and replace it with the Sea Foam. Run the car for at least a half hour. Flush out he Sea Foam with a quart of fresh transmission fluid, refill the system with transmission fluid. I used synthetic.

If this does not work, buy a pump.
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The soleniod just unscrews from the pump. You will need a Torx bit I think to remove. Just the center turns, the outer body stays in one postion. You'll see what I mean.
 
I tried the T-40 Torx before posting. The solenoid turned without any hesitation or break-loose sensation. This suggested that the assembly was just spinning, so I did not pursue further turning. The engineers need to correct this design. The thing backs out with the Torx.....It is just too easy!!!!! Thanks to all repliers!
 
rt2barbers said:
I tried the T-40 Torx before posting. The solenoid turned without any hesitation or break-loose sensation. This suggested that the assembly was just spinning, so I did not pursue further turning. The engineers need to correct this design. The thing backs out with the Torx.....It is just too easy!!!!! Thanks to all repliers!
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So can you replace it then? Can you even buy just the solenoid? I figured that this is the problem area with the pump and it was just gumming up, hence the Sea Foam. If you replaced the solenoid did that fix the problem? BTW, I have spoke with dealerships and their protocol to fix this is to replace the pump and the fan, not to troubleshoot the individual components. Bottom line is about $1400,00 bill out the door.
 
How did you drain it? I need to drain mine and do the seafoam transmission. I was looking for a friction reducer to see if I can get rid of this god awful noise and the guy at Parts Plus suggested this instead but you can never trust those guys.
 
JWerner2 said:
How did you drain it? I need to drain mine and do the seafoam transmission. I was looking for a friction reducer to see if I can get rid of this god awful noise and the guy at Parts Plus suggested this instead but you can never trust those guys.
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There's a dual plug in the bottom of the trans pan and one in the torque converter. There's a fill plug on the right rear of the case. The center plug of the dual plug has a stand pipe to check the pan's fluid level, as there is no dipstick.

first you drain the pan, pull the pan, change the screen, reinstall the pan, drain the converter, put 5-6 quarts into the pan, run it for 10-15 seconds, put another 4-5 quarts in the pan, run it, pull the center plug, and keep adding fluid until it runs out the center pan plug at operating temperature.
 
Im confused. So I do it as if I am doing the trans in turn flushing the trans as well?

All I want to do is the fan but I remember the two being paired some how.
 
The cooling fan and pump are there own loop. Same as the PS pump and rack they are there own loop. Trans not involved with either.
 
Then why do I need to do this...?

first you drain the pan, pull the pan, change the screen, reinstall the pan, drain the converter, put 5-6 quarts into the pan, run it for 10-15 seconds, put another 4-5 quarts in the pan, run it, pull the center plug, and keep adding fluid until it runs out the center pan plug at operating temperature.
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This makes it sound as if I am doing the trans fluid. I remember there being some sort of relationship between the two in which it causes the hose to tear or pop due to PSIs it wasnt designed to handle.
 
JWerner2 said:
How did you drain it? I need to drain mine and do the seafoam transmission. /QUOTE]

Pull the fluid return hose off and run it into a pan to collect. Run the motor for a few seconds to pump the fluid out.

Lincoln jealous is writing about something else, automatic transmissions, not the hydraulic cooling fan system.
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craigh said:
JWerner2 said:
How did you drain it? I need to drain mine and do the seafoam transmission. /QUOTE]

Pull the fluid return hose off and run it into a pan to collect. Run the motor for a few seconds to pump the fluid out.

Lincoln jealous is writing about something else, automatic transmissions, not the hydraulic cooling fan system.
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And thats what I figured. Thanks.
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Hydraulic Fan Pump Solenoid

Replacing the pump control solenoid restored my fan's high speed operation. Re draining details, I sucked out fluid from the reservoir with a small bulb syringe with 18-inches of vinyl tube attached to the tip. You can actually insert the tubing down into the pump suction line and almost completely drain the system. Also used the syringe on the pump suction and return lines with the reservoir removed to "prime" the pump after repair........fill the suction line, apply suction with the syringe to the return line.....spin the fan by hand to move fluid into the pump and air out......add fluid to the suction line as needed......remount reservoir......fill.....run the sucker!
 
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