986 whizzing coolant

[eltren]

Limped home late last night with:

A slowly blinking temp light and a modest indicated temperature.
Steam billowing from the RH intake.
Steam from under the roof compartment.

When I got home I could see a steady drip of coolant from a front central location, maybe edging a bit right.

Sounds like the pump to me, not that I've ever seen it outside of the book.
When these pumps go...do they leak like this?

Of course I'm hoping it's just a hose.

Any other highly likely culprits?

[Frodo]

Yes, when the water pump goes, you can definitely see coolant leaking. What year is your Box? My wp died at about age 10 years, but it's not unusual for them to go before that---sometimes WAY before that.

You need to get the car elevated (jack stands or ramp) and just get under there (safely!) and look. You may need to remove one or both of the plastic splash shields.

[san rensho]

Sounds like the pump. Get underneath car and see where the leak is coming from. Do not drive if its the waterpump.

[Frodo]

BTW, if it's from the front end of the car, it's probably NOT the water pump. More like a hose connection to a radiator or the radiator itself.

[eltren]

Thanks to all!

The 'Box is a '99 with 80k mi.

What is the degree of difficulty to DIY? Time required?

What are the gotchas/related issues?

For example, if i'm in there yanking the pump, what hoses should I be looking at?

Any additional parts/goop needed?

[san rensho]

Originally Posted by eltren

Thanks to all!

The 'Box is a '99 with 80k mi.

What is the degree of difficulty to DIY? Time required?

What are the gotchas/related issues?

For example, if i'm in there yanking the pump, what hoses should I be looking at?

Any additional parts/goop needed?

DIY is not too hard. Be sure to get a Porsche water pump, there are many reports of failures of aftermarket pumps. At the same time that you do the water pump, I would recommend that you do the motor mount, a part that commonly fails on these cars at your mileage. It's not that expensive, a little over $100, and removing the motor mount makes replacing the water pump much easier.

[eltren]

Thanks for the good info.
so...Just guessing: Removing the motor mount requires supporting the engine.

Which ought to be done with a floor jack, maybe some lumber, not a bottle jack.

Right?

Who do you like for parts?

[Frodo]

Pretty good DIY info for both tasks here:

DIY Projects: Do-it-Yourself Repair and Maintenance for your Porsche


It was the water pump? Why's it leaking from the "front central location"?

[san rensho]

Originally Posted by eltren

Thanks for the good info.
so...Just guessing: Removing the motor mount requires supporting the engine.

Which ought to be done with a floor jack, maybe some lumber, not a bottle jack.

Right?

Who do you like for parts?

The scissor jack in the car's toolkit works great with a couple of pieces of 2X4 underneath it. Very precisely and easily lowers and raises the motor.

[eltren]

It's SO hard to hold a wrench without opposable thumbs...

The tray under the driver's seat flooded over the last two days of rain.

I wasn't driving it because of the coolant pump.
So I didn't notice.

Last night I saw a solid red LED on the upper dash.
Car wouldnt lock.
This morning I vacuumed about a gallon of water out from under the driver's seat. Wont start, does activate, does show idiot lights, fan, radio, etc came on.

Then the windows cranked down, stopped, but the motors kept turning.
Quick where's the wrench?
Batt disconnected.

So.
Is it toast?

Am about to price coolant system parts. Does anyone here have reservations about the immobilizer coming back?

What's the tab if that sucker is shot? Do I suddenly have a parts car?

[eltren]

no vac or pressure tools at this time.

[Steve Tinker]

Eltren, as you probably know, the immobiliser CPU is located below the drivers seat - if it has been flooded, then the minimum you have to do is remove the seat and disconnect the immobiliser. You may be lucky and find the internal fuse blown, but as it has been immersed you will have to dry the immobiliser out completely - but I suspect you may have lost it.....This new problem is far bigger than fitting a replacement coolant pump.
Big dollars I'm afraid - I'm sure that someone on the board will chime in with an approx $$ cost.
It would retail at about $3 million here in Australia, but you guys get it a lot cheaper in the US than here !!!

[eltren]

It was in fact the coolant pump.
Replaced, ditto 4-way hose, ditto thermostat, ditto serpentine.

Total PITA, but gratifying.

Been blowing hot air on the immobilizer with a hair dryer for days.

It fired up on the first try.

I let it run for a while, pouring coolant the whole time.

Turned it off.

Wouldnt start. Everything looks good, just no starter.

Disconnected the battery for about 5 min.

That worked...a couple times.

And then it didn't.

Ideas?

[crumbum]

Originally Posted by eltren

I let it run for a while, pouring coolant the whole time.

Ideas?

Did you keep pouring coolant into the car? Or did the car keep pouring out coolant?

I am thinking the prior. However, I don't understand why.

[eltren]

Was pouring because the cooling system was empty. Fill the reservoir, let it belch and fart for a while and such down coolant, fill and wait some more.

The repair -so far- seems shockingly tight and competent.

I will pull the seat tomorrow, do the connectors at minimum.

It's idling in the driveway right now.

[san rensho]

Take out the seat, take out the alarm unit, dry everything out, clean connections, put it back together, pray.