General mk1 punto sx overheating

[casement60sx]

Hello i have recently been experiencing my punto overheating badly i have replaced the thermostat on it and it still seems to overheat the cooling fans wont kick in either the temp guage rises to about 3/4 and i am worried what are the ways of solving this problem my mate suggested unblocking rad hoses as the top hose was stone cold but the bottom hose was warm i have bleed the system before in the punto but i cant remember how i did it i know that that their is two bleed nipples and no water came out of the one that is on the radiator HELP! reply asap

 

[wilko1992]

One bleed nipple on rad and other is on the hoses goign to the heater matrix through bulk head, have you checked the fuse for the fan? If ok then

test the fan off the battery to see if it still ok if it is then i would suspect the temp sensor needs replacing

 

[puntosales]

hi

could be the water pump ... the impellor could have a come off the pump ... but try the basic first ... ... then on to the heavy stuff ...if the water not circulating could be thermostat or the water pump .......... or could be a blockage in rad ....

good luck

puntosales ..

let us know

 

[wilko1992]

hi

could be the water pump ... the impellor could have a come off the pump ... but try the basic first ... ... then on to the heavy stuff ...if the water not circulating could be thermostat or the water pump .......... or could be a blockage in rad

:yeahthat: as well

 

[casement60sx]

it cant be water pump i dont think cause the bottom hose was warm and water came out once we took pipe off

 

[fingers99]

Try the thermostat first. The radiator fan won't come on because the radiator doesn't heat up. and the top pipe stays cool because no hot water can get through it.

Simples!

Now, let's hope the HG is still intact.

 

[casement60sx]

i have replaced the thermostat and i connected the top hose back up the top hose seemed to stay cold and the bottom hose was warm so i think it may be blocked rad or air lock

 

[fingers99]

Next most likely is failed water pump. But make sure you bleed the system. I think there be something in the guides.

 

[casement60sx]

how can i unblock the heater cores ?

 

[wilko1992]

take off hoses and flush with the hose pipe on high pressure in the top end of the rad should flush it out

 

[casement60sx]

would i under both hoses or just one if so which one ?

 

[fingers99]

Undo them both. You might try reverse flushing, but it's not likely to make too much difference which way round you do it.

 

[DaveMcT]

how can i unblock the heater cores ?

Seemples. Buy a new radiator for £30. Its probably leaking anyway.

Squeak

 

[casement60sx]

right i think i have solved it just bled the system the fan kicked in at a third past quarter is this normal i have yet to check and fill it back up yet

 

[fingers99]

You mean 3/4? That'd be about right.

BUT keep a good eye on it. Do not assume that the two are related -- the most common cause of the rad fan not coming on is a faulty earth. Something may have just tripped it.

Compression test recommended.

 

[casement60sx]

no i dont mean 3/4 i mean it was half way between quarter mark and half way mark and pressure tested i have pressure rad cap on it and would putting abit more water in the filler tube than max hurt the car ?

 

[DaveMcT]

If its filled too far, air bubbles cant escape when bleeding the cooling system. If its run with too much coolant the excess will be blown out. Its ok to overfill a little but dont go mad.

If the heater is gurgling you have air bubbles which will damage the engine so bleed it properly and top up as needed.