[MR2] MK1 Coolant Problem

[Dennis McFayden]

One other item I failed to mention. This problem seems to have suddenly appeared. I always check everything on my car once a week. It is a daily driver, about 60 miles a day. 
 
Dennis

--- On Sat, 9/19/09, Aaron Willis <te51levin at fastmail.fm> wrote:


From: Aaron Willis <te51levin at fastmail.fm>
Subject: Re: [MR2] MK1 Coolant Problem
To: "Dennis McFayden" <mr2garage at yahoo.com>, "MR2 Email" <mr2 at mr2.com>
Date: Saturday, September 19, 2009, 10:00 PM


Have you ever replaced the overflow cap and its hoses?  They tend to get
brittle and leak, if not come apart entirely.

On Sat, 19 Sep 2009 20:54:10 -0700 (PDT), "Dennis McFayden"
<mr2garage at yahoo.com> said:
> I posted this problem before and got a couple of good ideas but not
> worked. The problem is that my cooling system does not suck back the
> coolant from the overflow tank. 
>  
> I have replaced the radiator cap three times with new OEM caps. N o help
> there. The symptoms are:
>  
> 1) I have pressurized the system to 16 PSI for over an hour and the
> pressure holds, no leaks. I pressurized the whole system even the
> drop-down tube going into the overflow tank. 
>  
> 2) I have not lost any coolant. 
>  
> 3) With my pressure tester attached in place of the radiator cap I can
> create a vacuum to draw the coolant back into the system. 
>  
> The only thing I can come up with now is a possible flaw in the seal
> between the cap and the place where it attaches. No flaw is visible. My
> pressure tester attaches in the same way as the radiator cap. 
>  
> It may be possible(?) that air gets sucked into the cooling system
> instead of the coolant from the over-flow tank. That would be a rather
> complex one way leak that would not show up under pressure. I have also
> created a vacuum in the system to see if it would hold. It did but I
> didn't create much of a vacuum. 
>  
> Any ideas would be appreciated. The car cooling system doesn't come close
> to over heating, works very well even the the AC on and our high CA
> temps. 
>  
> Dennis
>  
> This is a '87 MR2 

-- 
Aaron Willis - '85 AW11 7A-GE, MSnS-Extra, E85, etc
Club discount on OEM Toyota parts - email me at work! awillis at lithia.com




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