Discussion
ok,i know about loss of coolant through the cylinders on some v8s but what about when the engine has been quite hot in traffic?
i have had to top up twice now both times after a traffic jam,i drive on and then a few miles later the coolant light comes on,i guess after the temps dropped and hence the water level.
any suggestions?
no obvious leaks by the way.
mike.
i have had to top up twice now both times after a traffic jam,i drive on and then a few miles later the coolant light comes on,i guess after the temps dropped and hence the water level.
any suggestions?
no obvious leaks by the way.
mike.
Mike - there can be several explanations on coolant loss, don't assume its a leaking liner problem until you've ruled out everything else.
Here's a couple of useful suggestions i've kept from previous discussions:
>> Edited by rob.e on Tuesday 27th July 14:03
Here's a couple of useful suggestions i've kept from previous discussions:
lotuscars said:
The cooling system of the Esprit has undergone a few changes in configuration. First please check the following:
Maintenance Procedure
1. With the engine completely cold, adjust the coolant level in the header tank at the right hand rear of the engine bay, to the bottom of the filler neck. The expansion tank in the right hand rear wheelarch may be empty, as any contents will be expelled when the engine is fully warm.
2. Check that the header tank is fitted with a 145 kPa pressure cap, and the expansion tank is fitted with a blanking cap.
3. As the engine warms up, the coolant will expand and start to fill the expansion tank. When fully warm (i.e. the cooling fans have cycled on/off several times), coolant may be expelled from the expansion tank overflow. On cooling down, negative pressure will open a valve in the header tank pressure cap and allow coolant to be drawn back from the expansion tank into the header tank. A small amount of coolant may remain in the expansion tank due to the pressure differential required to open the recovery valve in the pressure cap. The header tank will no longer be full, with the level lying typically at around three quarters full. If the system is not disturbed (i.e. the header tank cap is not removed), further drive cycles should result in the header tank cold coolant level stabilising somewhere between half full and full.
If the header tank is repeatedly topped up to be fully filled (as stipulated in current literature), the subsequent dropping of the level may be perceived as coolant consumption/loss.
Another point to check is the hose between the header tank and expansion tank which can leak air and prevent the coolant from the expansion tank being recovered. Rubber hose tends to be more durable than the clear plastic hose originally fitted.
There was a running change of the cylinder liner sealant in June 2000 to Hylomar 3400, which allows the heads to be removed without the necessity to re-seal the liners. A significant leak at this joint will result in water contamination of the oil, although small leakages will evaporate off. Diagnosis requires removal of the sump for inspection whilst the cooling system is pressurised.
marcus at pukesprit.de said:
Please check the following:
- check all hoses and clamps also the hoses and lamps of the recirculation pump system
- make sure that the system is full with coolant and no air pockets are still in the system (I know this is not easy to check
- you may consider to bleed the whole cooling system like it is shown in the manual (I know its a pain to do)
- check the thermostat for proper function
- check the water pump (belt tension)
- check the radiator (leaks, clogged)
>> Edited by rob.e on Tuesday 27th July 14:03
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