[MR2] mk1 underheating

[Bob S]

DITTO on this one.  Use only OEM thermostats!

I spent three winters trying to make my wife's Geo Prizm GSI make heat.  It
got up to temperature in the shop but once it was less than 20 degrees
outside it would barely make heat

Since I didn't drive this much it wasn't much of a concern so every year I
would install a new aftermarket thermostat forgetting that I had done it the
year before.

I was stuck driving this car for a week and suddenly understood what my wife
was always complaining about.  Ordered a Factory Thermostat and the car made
heat and never gave me another problem.

Bob



-----Original Message-----
From: mr2-bounces at mr2.com [mailto:mr2-bounces at mr2.com] On Behalf Of
jrichter2 at wi.rr.com
Sent: Thursday, November 29, 2007 9:33 AM
To: William Brandt
Cc: mr2 list
Subject: Re: [MR2] mk1 underheating

I had that problem several years ago on my '87.  Temp gauge was fine 
at 50 mph and below.  Anytime I'd go faster than that, the gauge would 
drop.  The faster you'd go, the lower the temp.  I had my mechanic 
replace the thermostat 3 times, never fixed it.  Finally put in a 
Genuine Toyota Part instead of  an aftermarket, problem went away and 
never came back.


----- Original Message -----
From: William Brandt <wbrandt1 at sbcglobal.net>
Date: Thursday, November 29, 2007 1:13 am
Subject: [MR2] mk1 underheating
To: mr2 list <mr2 at mr2.com>

> While there can be several reasons for it overheating I think the 
> only reason for it "underheating" is a bad thermostat. 
> 
> I have noticed on my morning commute - I get on the interstate in 
> about 3 minutes - it should heat up very fast - the needle will 
> bounce up within 3-5 miles to normal - then as it opens a bit goes 
> down - then up - with a coolant capacity of 13 qts and 1600 cc you 
> have a lot of capacity for such a small engine - a lot of cold 
> coolant that keeps entering the block as soon as the thermostat 
> opens a bit....
> 
> I'd just get a factory thermostat - it is pretty will buried so 
> check your manual 
> 
> Bill
> 
> 86 with 252,096 miles today (not all in 1 day) 
> 
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> MR2 Mailing List
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> 

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