Could also be the waterpump as I had the same problem with an old Honda.
Mike
----- Original Message -----
From: "matt12@mail.rcip.com" <matt12@tuna.rcip.com>
To: <datsun-roadsters@autox.team.net>
Sent: Tuesday, May 22, 2001 11:16 AM
Subject: Cooling system problem
> Since I have not had any problems until recently, I have not paid a lot of
attention to the previous emails about cooling system problems. Just
recently (within the last 2 weeks) I have started having a problem with my
cooling system. Symptoms are as follows:
>
> Car runs fine at normal operating temperature no matter what the driving
conditions are, only rising when coolant is low.
> Ambient temperature ranges from 75-100 degrees.
> While car is running, I have no coolant leaks.
> With radiator cap (thermostat housing) off, I can see the coolant flowing
once the car warms up.
> After turning the car off, my car pukes out through the overflow/reservoir
loosing about one cup or more of coolant each time (seems to be only after
being driven hard at higher rpms - 4500+).
> I have compression tested all cylinders. Compression is even across and
there was no bleed down on any of the cylinders (leading me to believe my
head gasket is ok).
> The oil is clean with no signs of coolant.
>
> I am lost. Help please....
>
> Matt
> '70 1600
>
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