Re: Transit overheating
- From: "Moray Cuthill" <moray_dot_cuthill@xxxxxxxxx>
- Date: Sat, 31 Dec 2005 17:33:49 -0000
"David Cawkwell" <david.cawkwell@xxxxxxxxxxxxxxxxx> wrote in message
news:9Gytf.277$ZZ4.240@xxxxxxxxxxxxxxxxxxxxxxx
> Hello,
>
> My transit 1994 plain 2.5 diesel has started overheating.
>
> Normally the temperature hovers over the O of NORM
> but now the temperature hovers around the M or bottom of the white
> line if running or drops to the R at idle.
>
> I have replaced the thermostat but this has made no difference.
> I am not loosing coolant and there is no water contamination in the oil.
> Top radiator hose feels hot and temperature drops as you feel down the
> radiator.
>
> Any suggestions? Faulty temperature guage sender unit?
> Water pump?
How hot is the coolant in the top hose?
If the engine really is running at that temperature, you won't be able to
hold onto any of the top hoses for long (couple seconds at most), as the
coolant won't be very far away from boiling.
Usually the temperature gauges just fail on these (usually don't register
anything), or very occasionally the senders go short circuit and permanently
read of the scale.
Personally, I'd try running the engine with the thermostat removed, and see
how the temperature gauge reads.
Even the new thermostat could be faulty, and not opening fully.
And while you're removing the thermostat, take the radiator hoses off, and
stick a garden hose in the top of the radiator and check water is flowing
through the radiator. It should run out with the minimal amount of
dirt/sediment. If it's obviously full of crap, best option is to remove the
radiator and give it a good flush out, until the water runs through clearly.
Then stick the hose in through the thermostat housing, and check the engine
for crap.
If the gauge still reads hot with the thermostat removed, and everything
flushed out, try taking of the two bleed hoses to the header tank. There
should be a steady flow out both of them with everything hot (the one from
the thermostat housing should have a stronger flow, and should will also
flow before the thermostat opens). If there's no flow, remove the hose and
check it's not blocked. If there's not any blockage, it's most likely
something major wrong with the water pump.
However, if the guage is still showing hot, try a new sender unit, followed
by a gauge if it's still not working.
.
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