Cavaliar cooling system Isuzu Diesel)

Just wondering if anyone else has had the same problem as me. The
temperature gauge on my Vauxhall Cavalier 1.7TD(Isuzu engine) had always run
at 90 degrees until one day on my way back from Cardiff the gauge went to
100 degrees, since then it fluctuates between 90 and 100.

Usually when I am travelling at 70 the temperature is normal. I have tried
changing the thermostat and the fan sensor on the radiator but this has not
helped.

I hope there is someone out there who can guide me in the right direction.

Many thanks in advance.

 

Does the heater still work, may need coolant replacing.

But saying that, my 7 year old astra tds (same engine)
occasionally goes to 100 deg, whilst still and idling.
The thermostat i know for a fact doesnt come on till 100 then knocks off at
95.
You probably dont have a problem.

 

Yes the heater is still in working order, thanks for the advice, I will just
persiver for now .

Thank again.

Dave

 

Hum?? I had one of those- wonderful motor (55mpg). The car used to sit
at 90C unless it was working hard uphill or in traffic when it went up
to 100C. Never heared the rad fans cut in and it did not use a drop of
water. I did have a problem with the thermostat (it's a special double
thermostat) when the heater output fell. I seem to think that it did
behave a little oddly. Garage changed it in the end 'cos I was too busy.
£50 to £80 I think.
If the water level is Ok, the heater works then you should be OK.

 

Sounds like the engine temp is creeping up until the fan cuts-in, then cools
it down again. This is quite normal - nay, it's what you expect to happen -
if you are stationary or just creeping along in traffic, but not if you are
driving along normally.

So - if driving along I would suspect that either the water is not
circulating or the rad is blocked, or air cannot get to the rad. So you know
what to look for there, then!. Check the hoses are in good nick - older,
softer ones can collapse at high speed lesading to lack of water flow.

 

Sounds like the engine temp is creeping up until the fan cuts-in, then cools
it down again. This is quite normal - nay, it's what you expect to happen -
if you are stationary or just creeping along in traffic, but not if you are
driving along normally.

So - if driving along I would suspect that either the water is not
circulating or the rad is blocked, or air cannot get to the rad. So you know
what to look for there, then!. Check the radiator hoses are in good nick -
older,
softer ones can collapse at high speed leading to lack of water flow.

 

These vehicles are sometimes fitted with a two speed cooling fan (two thermo
switches or a three wire sensor on radiator). A common fault is that the
resistor for low speed burns out and the fan will not run at low speed. You
can change the resistor and or short it out so the fan runs at full speed.
If you look at a wiring diagram (Haynes manual) and follow the cables or
look in the area below the battery tray you should locate it.



Steve

 

These vehicles are sometimes fitted with a two speed cooling fan (two thermo
switches or a three wire sensor on radiator). A common fault is that the
resistor for low speed burns out and the fan will not run at low speed. You
can change the resistor and or short it out so the fan runs at full speed.
If you look at a wiring diagram (Haynes manual) and follow the cables or
look in the area below the battery tray you should locate it.



Steve