Radiator drain plug
Thread Starter
Drifting
Joined: Apr 2011
Posts: 3,037
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From: New Canaan, CT
Radiator drain plug
The drain plug on my 90 S4 broke. What is the size and Is this readily available from the local parts store?
If not, Can I put something in temporarily until I order the correct one?
Thanks
If not, Can I put something in temporarily until I order the correct one?
Thanks
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From: Double Oak, TX
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Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
Thread Starter
Drifting
Joined: Apr 2011
Posts: 3,037
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From: New Canaan, CT
Radiator, flush & fill
I would like to flush the radiator with distilled water by letting the system run with just that for a couple of days. Then draining it and filling the system up with coolant and distilled water.
Is the distilled water alone corrosive?
Thanks
Is the distilled water alone corrosive?
Thanks
Nordschleife Master
Joined: Jun 2006
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From: ɹəpun uʍop 'ʎəupʎs
For a flush, I'd just fill with tap water, and add a radiator flushing agent. Then follow the instructions (usually warm up car for 30 mins or similar). Then rinse thoroughly again (including opening the block drain plugs a few times after refilling with more water).
Once you've flushed it, *then* put in the distilled water, with the coolant of your choice (something free of phosphates/silicates/borates).
Flushing with distilled water won't help extract any of the depositions and smaller sediments that collect in the system.
Once you've flushed it, *then* put in the distilled water, with the coolant of your choice (something free of phosphates/silicates/borates).
Flushing with distilled water won't help extract any of the depositions and smaller sediments that collect in the system.
Team Owner
Joined: May 2004
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From: Philly PA
I would caution against adding any type of flushing agent to the coolant system,
if you do you will be exposing the head gaskets to whatever cleaner you install and this could be a quick path to replacing the head gaskets.
If you want to clean things out open the block drains, drain out the old coolant,
remove the radiator and back flush it with a hose,
run the hose water through the block,
open the drains and let it drain.
Then install the radiator,
install a new heater control valve and short hose,
as well as a new coolant bottle cap,
and also replace the thermostat and the rear seal and O ring,
refill with 2 gallons of Z O5 coolant and 2 gallons of distillled water
if you do you will be exposing the head gaskets to whatever cleaner you install and this could be a quick path to replacing the head gaskets.
If you want to clean things out open the block drains, drain out the old coolant,
remove the radiator and back flush it with a hose,
run the hose water through the block,
open the drains and let it drain.
Then install the radiator,
install a new heater control valve and short hose,
as well as a new coolant bottle cap,
and also replace the thermostat and the rear seal and O ring,
refill with 2 gallons of Z O5 coolant and 2 gallons of distillled water
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Thread Starter
Drifting
Joined: Apr 2011
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From: New Canaan, CT
The only problem with flushing with a hose is that I have well water. It has been tested and the report said it is very hard water and has iron and copper in it plus it is not filtered. Do not want to take a chance snd maje things worse. Therefore was wondering if filling up with distilled water and driving for a few days and then draining and filling with the coolant and distilled water would be appropriate.
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From: Bristow, VA
Only drawback to distilled water is you've got to buy it vs what's easily available. Distilled water is exactly that: H2O to some purity standard that escapes me. I would not use well water for anything except brewing beer. If you habe enough distilled to flush and run a couple of times, you'll be fine as long as you keep to a nice coolant swap interval.
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From: Sydney AUS
The only problem with flushing with a hose is that I have well water. It has been tested and the report said it is very hard water and has iron and copper in it plus it is not filtered. Do not want to take a chance snd maje things worse. Therefore was wondering if filling up with distilled water and driving for a few days and then draining and filling with the coolant and distilled water would be appropriate.
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From: Fairfax, VA
