[Supras] Thermostat Question Again!

[Jim Jobe]

Are you running pure water?  Those are the same symptoms I had
when I did.  Suggest a ~30% mix of coolant.

On Tue, Aug 07, 2007 at 11:32:13AM -0400, Charismatisch at aol.com wrote:
> Hi there guys and gals,
>  
> I am sorry to have triggered-off such an argument with my question, however  
> my problem still remains the same.
>  
> The radiator is brand new, so are all the gaskets (inclusive valve shafts  
> and HG). I did a full oil-change and coolant-change with the HG and replaced the 
>  plugs. The whole fan and clutch is also brand new.
>  
> If I stay in town traffic, the temp gauge never goes above the  halfway level 
> and the car runs beautifully and shows me a full radiator once it  cools down 
> and I am able to open the rad.cap. The heating blows hot after about  a 
> minute already, indicating to me that the thermo is functional at the  beginning.
>  
> Once I take the car onto the Autobahn at 150+ mph and as long as it is  being 
> cooled by the air from the front, the temp stays ok. When I come off the  
> Autobahn and reach the first stop sign, the temp slowly climbs into the red and  
> comes back down a little when I drive off again. When I reach home, the water 
> in  the expansion tank is gurgling. After spewing a little, the rad. shows me 
> too  little water.
>  
> Also, the main rubber pipe to the rad. at the top is often warm/hot and has  
> some air in it, whereas the bottom rubber pipe from the rad. to the engine is  
> cold or cooler. This would seem to indicate, that the flow of the water is  
> getting partially 'stuck' or 'slowed-down' somewhere, which may mean, that  the 
> thermo is not functioning fully and creates a kind of 'tailback' or  
> 'congestion' in the system and is not allowing it to flow fast enough when the  engine 
> is under duress.
>  
> As a layman I would think that the thermo is closing fully when cold (hence  
> the heating working soon and well at first), but not opening fully when the  
> coolant/water mixture is hot. This wouldn't become apparent at slow speeds/town 
>  traffic, but under strain at 150 mph the thru-flow would not be sufficient 
> once  the car comes to a hot standstill.
>  
> Your comments please??.
>  
> Derek, 88T Automatic.
>  
>  
>  
>  
> 
> 
> 
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