From: [email protected]
Date: Thu, 1 Aug 1996 09:29:45 -0400 (EDT)
Subject: Re: Flushing the radiator

[email protected] wrote:
> I will be draining the radiator water\fluid soon. Is there anythin
> specifc
> to the delroean that I should know? Is it like most other cars? What
> should
> the mixture be?

The cooling system on a DeLorean is a vacuum system and is prone to something a'kin to vapor lock and will cause overheating if the air is not bled properly. Here is the procedure I use.

Run a piece of vacuum hose (about 3 feet) from the air bleed screw located on the thermostat housing at the back of the engine into a bucket full of water. Run water from a garden hose into the header bottle. Start the engine. Open the bleed screw. Turn on the car's heater.

As the engine runs, you should get bubbles from the end of the vacuum hose. Keep running the engine until the fans have cycled on and off twice. (This ensures that the thermostat has opened and any air trapped in the heater core has had a chance to circulate).

When you get no more bubbles, shut the engine off, but leave the bleed screw open. Slowly pour one gallon of anti-freeze into the header bottle. This will force a gallon of water out through the bleed screw and into the bucket, but it is so far downstream in the cooling system, you will not loose any anti-freeze.

Note: The cooling system holds 2.9 gallons. The above mixture is about 35% anti-freeze and 65% water and works fine here in Southern California, but if you want to use the recommended 50/50 mixture, you should add about 1 1/2 gallons of anti-freeze instead.

CLOSE THE BLEED SCREW BEFORE TAKING THE END OF THE HOSE OUT OF THE BUCKET! Then you can pull the hose off of the bleed screw and put the cap back on the header bottle.

Hope this works as well for you as it has for me.

Hank Breer
DOA #4637