[MR2] MK1 Cooling System Problem

[Chris S]

OEM cap, Definitely.    the offshoots suuuuck.
----- Original Message ----- 
From: "Bob Schultz" <bob-schultz at comcast.net>
To: "'Dennis McFayden'" <mr2garage at yahoo.com>; "'MR2 Email'" <mr2 at mr2.com>
Cc: "'MR2 Email'" <mr2 at mr2.com>
Sent: Thursday, September 10, 2009 12:56 PM
Subject: Re: [MR2] MK1 Cooling System Problem


> The OEM cap would be a good investment.
>
>
>
> Aftermarket seem to work ok with American Cars but I had a Prizm that
> required an OEM thermostat and Radiator cap. it took me quite some time to
> figure that one out.
>
>
>
> Bob
>
>
>
> From: Dennis McFayden [mailto:mr2garage at yahoo.com]
> Sent: Thursday, September 10, 2009 12:03 PM
> To: 'MR2 Email'; Bob Schultz
> Cc: MR2 Email
> Subject: RE: [MR2] MK1 Cooling System Problem
>
>
>
>
> One test I will do is to perform a pressure test when the system is cool. 
> If
> that passes then I will get a new OEM cap. .
>
>
>
> Dennis
>
> --- On Thu, 9/10/09, Bob Schultz <bob-schultz at comcast.net> wrote:
>
>
> From: Bob Schultz <bob-schultz at comcast.net>
> Subject: RE: [MR2] MK1 Cooling System Problem
> To: "'Dennis McFayden'" <mr2garage at yahoo.com>, "'MR2 Email'" <mr2 at mr2.com>
> Date: Thursday, September 10, 2009, 8:43 AM
>
> Your Radiator cap could still be the problem... I have had a bunch of
> defective even brand name caps.
> If it isn't the cap, check out the sealing area on the filler neck,  a 
> chip
> there (and I have seen it) will prevent the cap from sealing.
>
> If that doesn't seem to be a problem, then you have a leak in the system
> somewhere... it may be a small one but it is preventing the system from
> going into a vacuum when it cools down.
>
> Get a cooling system pressure tester. You might be able to borrow one from
> AutoZone, they do have a tool loan program. If not try the other big
> boxes...  This is about the only way to find a leak and it is possible 
> that
> you have a small leak and it is enough to prevent a seal but not enough to
> really leave a puddle.
>
> Bob
>
>
>
> -----Original Message-----
> From: mr2-bounces at mr2.com
> <http://us.mc623.mail.yahoo.com/mc/compose?to=mr2-bounces@mr2.com>
> [mailto:mr2-bounces at mr2.com
> <http://us.mc623.mail.yahoo.com/mc/compose?to=mr2-bounces@mr2.com> ] On
> Behalf Of Dennis
> McFayden
> Sent: Thursday, September 10, 2009 11:33 AM
> To: MR2 Email
> Subject: [MR2] MK1 Cooling System Problem
>
> This problem just started. First I am not loosing any coolant nor is my
> engine over heating. The problem is that the cooling system does not suck
> the coolant back into the system when it cools down.
>
> I have changed the radiator cap. I have also checked to make sure that the
> tube going between the overflow tank and the system is not plugged. I can
> pull coolant from the over flow tank with a vacuum. Things seem to be very
> normal except for this problem. When the system has cooled down I can 
> remove
> the radiator cap and don't see coolant. I can manually recover the coolant
> from the over flow tank into the system and see that the total amount
> remains the same.
>
> Anybody have an experience like this?
>
> Dennis
>
> This MR2 is an '87 NA.
>
>
>
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