omniphil

Ok, I went out in the garage this morning and heard a noise under the hood, the small water pump for the turbo was still running (the car had been sitting at least 12 hours) I figure there is some sort of thermostat switch that regulates this pump on and off? If so where do i find it? Anything else I should check? I unplugged the electrical connection to the pump for now but I dont want to drive the car like that. If I plug the harness back in, the pump starts right back up again. something must be stuck?

Ski

There is a single point temp probe, one lead, going to the water piping,,try unplugging that while it is runnnig see what happens. Get your owners manual and see which relay it is, unplug it, tap on it. If you tap on it lightly and the pump goes off that is more than likely your problem.

omniphil

Thanks, I pulled the relay and the pump shut off, after waiting a few minutes i plugged the replay back in and the pump stayed off, probably need a new relay, although it didnt turn the pump off when i tapped it with a screwdriver. Another quick question, should the turbo water pump run when the car is on or only after you shut down the car? When the engine was cranking the pump turned back on?

Ski

The pump turns on based on temp,,I think, whether that is based on engine on or turned off I'm not sure. You might want to see if the A/C relay is the same number,,or try one that has the same number and plugs,,not needed while the car is running.

Jeremy Martin

those relays fail all the time.

IceShark

I don't believe the pump is supposed to run at all when the engine is running as the turbo is getting water from the water pump.

When the engine is shut down the pump will run approximately 30 seconds no matter how cool things are. But it will run longer if the temp sensor reports water is too hot.

AMCPILOT

Hello,

I had exactly the same thing happen ... turned out it was not the relay, but the temp sensor itself. New part # (superceeded) has a different lead connector, requiring the harness wire to be slightly modified (round connector to square one). You can change it out without draining the coolant ... just a little will come out when you swap out the temp sensor (do it when the engine is cold!)
Hope this helps.

omniphil

Can you give me an idea where this sensor is roughly? There is a one wire sensor somewhat near the turbo and electric pump, is that the one I'm looking for?

AMCPILOT

OK,

Here is a photo. The sensor is just to the left of the throttle body. You can see the new wire I had to make as the old circular pin connector has been superceeded. The part number is: 93060611800. To test if this is the culprit, after you shut your engine down wait about 30 seconds and if the H2O pump continues to run, disconnect the connector on the sensor. In about 5 seconds, the H2O pump should cease operating. If this works, then touch the connector to a grounded piece of metal. If the pump comes on again, you know the sensor is bad ... hope this helps.

omniphil

[quote]Originally posted by AMCPILOT:
<strong>OK,

Here is a photo. The sensor is just to the left of the throttle body. You can see the new wire I had to make as the old circular pin connector has been superceeded. The part number is: 93060611800. To test if this is the culprit, after you shut your engine down wait about 30 seconds and if the H2O pump continues to run, disconnect the connector on the sensor. In about 5 seconds, the H2O pump should cease operating. If this works, then touch the connector to a grounded piece of metal. If the pump comes on again, you know the sensor is bad ... hope this helps.

</strong><hr></blockquote>

You hit the nail on the head! It did exactly what you said, i guess i dont have to buy a $75 relay, I hope the sensor is cheaper

This would also probably explain why the car will sometimes not start at all, it just cranks and cranks.

Thanks for the help!

omniphil

I'd just like to put some closeure to this thread. I got my new temp sensor in the mail today with the part number amcpilot listed and everything works as expected now. The diagnostic he listed was perfect. The relay was not bad.

Thanks again!

AMCPILOT

Glad it worked out for you! THanks for the follow-up!
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