Check your radiator cap. I had an overheating problem in one of my cars
but only at altitude (6,000 ft and higher). The cap was not holding pressure
and I would get boil over even when the car was just at normal operating
temperatures.
A new cap solved the problem.
Dave
In a message dated 3/13/2013 12:19:28 PM Central Daylight Time,
wsb1960tr3a@att.net writes:
> So I've begun driving the TR3 to work again. It has been in the 80's
> during the day in Mojave. It is pretty brisk at 0600 at the mile high
> elevation that I live at.
> The temperature gauge in the TR3 has lost the
> ether and is getting sent in to be rebuilt asap.
> So yesterday I am
> driving home. The TR runs like a freight train. I coasted down about 1/2
> mile
> and downhill and stopped outside my garage. While the garage door is
> opening
> the car overheats and steam comes out.
> I topped off the coolant. Later
> that evening I let my daughter drive the TR with me in the car with her.
> We
> are tooling around the hills at low speeds, under 35 mph. We coast down
> about
> a mile of downhill and stop at a stop sign. I begin smelling hot coolant
> again. It is like it is taunting me.
> My radiator was rebuilt about 12
> years ago without a crank hole.
> I have blocked off the water pump bypass
> with a brass plug with a 1/8" hole drilled in it to prevent vacuum lock.
>
> I have an electric fan (puller, not pusher) that comes on at about 190.
>
> Tonight I am going to use a Prestone radiator flush and refill with fresh
> coolant and distilled water 50/50 mix.
> With the coolant out I am going to
> pour water in the top to see how fast it sloshes out the bottom hose hole
> to
> see if the radiator appears blocked..
>
> I only use distilled water and
> coolant in my radiator.
> Last year I put on a new Moss radiator cap and a
> new 185 thermostat and put on all new hoses.
> My question is, why does it
> overheat after a long downhill? I could see it overheating after a long
> uphill.
> Gotta get the temp gauge fixed. I meant to do it when the cold
> weather arrived.
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