Anti-freeze is a dangerous substance. DO NOT leave anti-freeze on the floor
or in a pan around animals or young children! It has a sweet flavor, but
it is deadly! If consumed, it will cause a slow and painful death. There
are non-poisonous brands of coolant on the market, but don't ever take chances
if there is any doubt.
Coolant Drainage (Dave Kase)
If engine is warm (just shut down):
Unhook the lower main radiator hose while the engine is still fully warm.
At this point the thermostat is open and the block water will drain through
the main rad. The thermostat is open if all the radiator hoses are warm (remove
cover in front of main rad to get to hoses). This should be done as soon
as possible after the engien is shut down. If only 3-4 quarts of coolant
come out, the thermostat is closed and the block will still have coolant
If engine is cooled down:
The Bentley says to drain the engine by disconnecting the lower main radiator
hose and the heater hose from the engine. The heater hose connection is buried
so disconnect the left hose from the firewall heater connection. Then lower
the hose below the block connection to drain the block. This method is a
bit messy as the coolant drains through some components under the hood.
Coolant Refill (Dave Kase)
Audi specifies only phosphate-free anti-freeze be used. Open bleeder valve
on heater hose where it goes through the firewall. It may be difficult to
get flow here until the car is started and the level in the coolant tank
goes down. Then replenish the tank and when the engine gets warm. It should
start to flow out of bleeder.
Coolant System Overhaul and Thermostat Redo (Dave Kraige ala Bernie Benz&Peter Kirby)
A detailed account with many photos.
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