overheating but no smoke from the exhaust

[lucas4288]

can anyone please help? i purchased a Doblo van which I thought was a good buy but the van over heats and throws the coolant/water out.
I thought that this may be the thermostat but this seems to be ok.
I purchased it from Wiltshire and drove all the way back to South Yorkshire with no problems, but the thing just over heats on every journey can some one give me any ideas or is it the head gaskit thanks Gav

 

[Trancendental]

Maybe you got a blocked up water system and the coolant aint circulating properly, check all the pipes maybe?

and does the Fan Initialise? might have a faulty fan switch that needs replacing or repairing.

 

[puntomk1]

get your head gasket checked my punto did the same the heater never got warm either.try not to drive it much before u get it checked as it can warp the head an if it does it will cost you serious £££.

 

[marinagreen]

Be certain to check all hose clamps involved with the cooling system. I found it best to replace the spring-type on my 128 with the stainless worm-screw type. The first one to check is where the coolant leaves the block and heads for the radiator. This one seems to like to get a little loose during idle after the engine is totally warm (as at a long traffic signal). I hope this helps!

 

[lucas4288]

Maybe you got a blocked up water system and the coolant aint circulating properly, check all the pipes maybe?

and does the Fan Initialise? might have a faulty fan switch that needs replacing or repairing.

Thanks for the advise, i have just put a new thermostat on the doblo and it seemed to have done the trick untill test drive on the motor way, the temp gauge went up and then went back to its normal setting of half I then carried on and it happened again.
I have now let the vehicle cool down and have now put the max level into the header tank, will see if this goes down over night.
Has any one else had this with the Doblo 1.9 deisel Van.
All the joints to the thermo seem fine ie clips on the pipes as i have renewed them when putting the termostat on.
The next thing is the radiator as it may be blocked some where, but this seemed ok when i flushed it out, but you never can tell any ideas PLEASE PLEASE PLEASE as i am getting too the end of my time with Fiat (SADLY) love the van as well but not the best work horse like the ford transit and yes i know this is being foul mouthed of me, PLEASE HELP! :bang:

 

[Trancendental]

i have just put a new thermostat on the doblo and it seemed to have done the trick untill test drive on the motor way, the temp gauge went up and then went back to its normal setting of half I then carried on and it happened again.

Fiat Fans are usually quite noisy, I can tell a Fiat Fan kicking in a mile away, tis just the way they are.

Check the floor in the morning, if its not damp then chances are the cooling system isn't leaking. but also check near the water pump for rusty colour (looks like sand) this may indicate that the water pump is spraying water on the inside of the engine bay and might be the source of a leak, you'll need a new water pump most likely.

Try this:

Turn on your Doblo and open the bonnet, wait until the temp gauge goes up and up and up. if the fan kicks in then the temp should go down and the fan switch off again. if the fan turns on and stays on and temp don't go down then you either havn't got enough coolant in or the coolant isn't circulating properly.

If the fan doesn't kick in at all then thats your problem. try hooking the fan up the the Doblos battery directly to see if it switches on. if it does then you need a new fan Plug and/or Socket.

if it don't then you probably need a new motor for the fan and I don't know if they are sold seperatly, might have to get a whole fan or something.

Problem with testing temp on the motorway is that at the speed you are driving, the air passing through the grille will keep your temp at a fairly safe level and you wont know until you stop at lights or start driving slowly around town.

 

[Alfa_Delta]

You are opening the heater controls to fully on hot arn't you? If not you create an air lock in your heater matix when you fill the radiator and when you open the controls, a bubble then runs round the system.

When you fill the system, do it from cold. Open the header tank, fill it up then start the engine. Squeeze the top hose and keep topping the header tank up (but don't overfill it). When it gets hot the thermostat will open and you can check the levels again. After this, refit the cap and you should be okay with no air locks anywhere.

Be carefull not to get anything entangled in the engine OR the radiator fan as this can come on quite without warning - even with the engine switched off!

If it overheats again - switch the heater to full on hot and make sure it is hot. This may cause the temp gauge to start to fall and if it does then your radiator fan switch (is probably not switching the fan in).

Bear in mind that if the gauge goes down it may be because it's sendor is sitting above the level of the water (which is far worse!!)

Out of interest, is your van Deisel or Petrol?

 

[lucas4288]

You are opening the heater controls to fully on hot arn't you? If not you create an air lock in your heater matix when you fill the radiator and when you open the controls, a bubble then runs round the system.

When you fill the system, do it from cold. Open the header tank, fill it up then start the engine. Squeeze the top hose and keep topping the header tank up (but don't overfill it). When it gets hot the thermostat will open and you can check the levels again. After this, refit the cap and you should be okay with no air locks anywhere.

Be carefull not to get anything entangled in the engine OR the radiator fan as this can come on quite without warning - even with the engine switched off!

If it overheats again - switch the heater to full on hot and make sure it is hot. This may cause the temp gauge to start to fall and if it does then your radiator fan switch (is probably not switching the fan in).

Bear in mind that if the gauge goes down it may be because it's sendor is sitting above the level of the water (which is far worse!!)

Out of interest, is your van Deisel or Petrol?

the van is a diesel one, today i have checked all the pipes and renewed some of them, we went for a ride in the van and the temperature gauge went up then after about 1minute came back down to the normall level.
we got home and the fan was cutting in fine but the heateer in the van was cold even though the engine was hot, there seems to be no bubbles in the sytem.
could this be a new radiator ?
any one had this problem ?
thanks gav :bang:

 

[Alfa_Delta]

If the van was so hot that the fan was cutting in and the air coming out of the heater was cold then there is either an airlock somewhere or a problem with the heater control on the dash...

 

[poggy]

Sounds like an air lock to me. You could try it without a thermostat for a day and see if that works.