Lee_D wrote:
> "Steven Chapman" <[email protected]> wrote in message
> news:[email protected]...
>
>>What sort of coolant loss over say a 20 - 30 mile of short runs could be
>>excepted if Rad Cap is split ?
>>
>>Thanks Steve
>>
>
>
> Depends on how bad the split is.. Ultimately it's going to keep boiling over
> and as such not keeping your engine cool enough even if the fluid does stay
> in. The system relys on pressure to prevent boiling occuring.
>
> Lee D
>
>
if the engine is running a viscous or directly coupled fan, and assuming
that there is no other fault cooling wise, then the coolant loss will be
minimal, and the engine should not overheat.
The thermostat is set to open at <90 degrees celsius, and this is
located towards the outlet of coolant from the engine, ie generally
hottest.
In the case of a electric fan, things may be different. The electric fan
is only operating when *it* sees a 'too hot' condition, and this is
irrespective of the thermostat temp. So as the engine passes the
thermostat temp, the thermostat goes full open, but in the absence of
air being forced through the rad (slow traffic/idle/offroad) the engine
temp *will* continue to rise. This may lead to areas in the coolant
passing 100 deg C, with local boiling, causing fluid loss.
To back this up, I owned a XR2i until recently, and its cap was shot, ie
held no pressure. It used very little water, and never overheated, even
in traffic. Fan switch was obviously keeping water below 100 deg
throughout system.
Terry,
Series IIa
