Re: [DML] Coolant Coming Out

["Joseph Kuchan" <josephkuchan@xxxxxxxxxxx>]

Mike, it may or may not be overheatring. If the cap is bad (weak spring, 
leaky gasket, both) then the car would expel coolant without necessarily 
overheating. The cap should be inspected and tested or simply replaced if it 
is old (they are cheap enough) to see if that solves the problem.

Dave Swingle recently tested a bunch of old caps from various cars and they 
alll wouldn't hold more than a few pounds of pressure. That seems to be a 
fairly commmon failure mode.

-Joe Kuchan


>From: mike.griese@xxxxxxxxxxxxxxxx
>Reply-To: dmcnews@xxxxxxxxxxxxxxx
>To: dmcnews@xxxxxxxxxxxxxxx
>Subject: Re: [DML] Coolant Coming Out
>Date: Wed, 14 Dec 2005 02:26:06 +0000
>
>Your car is overheating, which is forcing the coolant out of the overflow 
>valve
>in the radiator cap.  What does your temperature gage read normally?
>
>There are several reasons for overheating.  First is that your system is
>not airtight.  Your coolant system should hold 15lbs of pressure for at
>least 15 minutes.  You test this with a pressure tester, which is an air 
>pump
>that replaces your coolant bottle cap.  You also need to test your cap to
>ensure that it stays closed until it sees 15lbs.  Most coolant pressure
>testers have a fitting that allows you to attach the cap to the pump.
>
>The second reason for overheating is not bleeding the system properly.  The
>DeLorean is susceptible to air pockets in the coolant system, which can
>superheat and expand, forcing coolant out of the overflow valve.
>
>Third is that your thermostat is not opening at the appropriate temperature
>or not opening at all.  You can at least check to see if it is opening at 
>all by
>warming the car up and feeling the hoses up by the radiator.  If they stay
>cool, your thermostat could be stuck closed.
>
>The final reason for overheating is that your water pump has failed.  This
>has a similar symptom of  a stuck thermostat.  It is usually accompanied
>by a lot of squealing as the belt tries to turn a siezed pump or the 
>bearings
>are screaming out as they fail.
>
>--
>Mike
>
>
>-------------- Original message from "tuxr" <tuxdarby@xxxxxxx>: 
>--------------
>
>
> > Update: I've been putting in coolant for the last several mornings.
> > When I stop the car some of the coolant comes out of the hose that
> > connects to where the coolant cap is. Not alot, but some. I'm
> > assuming it's coming out when I'm driving, but I don't know that.
> > Other than the fact I keep putting more in. Any ideas what would
> > cause that? Thanks very much for the advice.






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