Hi, I am new to the forum. I own a 2006 FIAT SIENA 1.7TD. Had the head done about a year ago because of a head gasket.

Since then the car has been overheating. Recently did a couple of flushes of the cooling system and had the head gasket checked... none of it seems to be the issue.

The only thing remaining seems to be the thermostat which was also replaced about three years ago.

Is it possible to override the thermostat completely so that the water flows freely? And will this have a negative effect?

I can sort of help myself around mechanics, but this one has me baffled.

Replacing the thermostat is quite expensive, because it is a sealed unit.

Want to find alternatives... if any?!


Hugo

( wrong section...)

the thermostat isn't really a serviceable item,
so you could always just wedge it open,

then if it is improved- buy a new replacement,

how quickly does the temp gauge show the engine warming ?( from cold)

does it rise to mid-point then stabilise..??

Charlie

http://www.ebay.nl/itm/FIAT-PUNTO-1-7TD-THERMOSTAT-HOUSING-QTH590K-/191469377844?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item2c9476d934

(Same engine, so it probably will fit...)

Ebay is your friend....

varesecrazy said:

( wrong section...)

the thermostat isn't really a serviceable item,
so you could always just wedge it open,

then if it is improved- buy a new replacement,

how quickly does the temp gauge show the engine warming ?( from cold)

does it rise to mid-point then stabilise..??

Charlie

Click to expand...

The engine warms up as normal, but when you exert torque on the engine, the temperature goes up.

It reaches halfway and stays there. It only goes over that mark when you get to an incline or accelerate.

I have found a replacement thermostat - the part plus labour comes to £70. I will try it and see from there. When I take the old one off I'll first ask for it to be tested though.

In my country (South Africa) there isn't really cold conditions, quote the opposite. I still believe (in theory) that the car can run without the aid of a thermostat.

Thank you so much for the advise.


Hugo

(Same engine, so it probably will fit...)

Ebay is your friend....[/QUOTE]


Thanks mate. The Ebay version of the same part is £93. I got it for around £45... see photo... Thank you anyway. I will make use of Ebay in future.


Hugo

It's less than gbp 40, incl. shipping....???

theonlynapsta said:

The engine warms up as normal, but when you exert torque on the engine, the temperature goes up.

It reaches halfway and stays there. It only goes over that mark when you get to an incline or accelerate.

Thank you so much for the advise.


Hugo

Click to expand...

Hi,
check the oil cooler for function, :idea:

my TIPO TD had a damaged cooler - which I removed,
ran fine, but temp increased under turbo / high load,

Charlie

How's the condition of the waterpump?
They do fail from time to time,original propeller has plastic blades, that can come of, or get stuck....

varesecrazy said:

Hi,

check the oil cooler for function, :idea:



my TIPO TD had a damaged cooler - which I removed,

ran fine, but temp increased under turbo / high load,



Charlie

Click to expand...

Thanks Charlie. If I am correct, the oil cooler sits at the bottom next to the radiator?

How do I test it?

Thank you


Hugo

Peter Pick-Up said:

How's the condition of the waterpump?
They do fail from time to time,original propeller has plastic blades, that can come of, or get stuck....

Click to expand...

Hi Peter, checked the water pump and it seems ok - circulates the water - once I have replaced the thermostat I will check the water pump again.

Glad I joined this forum. Still trying to find my way around the app/site, but it is brilliant.


Hugo

theonlynapsta said:

Thanks Charlie. If I am correct, the oil cooler sits at the bottom next to the radiator?

How do I test it?

Thank you


Hugo

Click to expand...

unbolt the hose union by oil filter, and check it drains down o.k.

Charlie

Thank you, will do and let you know. Thank you for the advise.


Hugo

Is the radiator not blocked? Full off sand dust leaves etc. It's maby a possible reason for high Temps. When air can't circulate true it probably. It's can cause the heat to rise as well. If u not checked this before take a closer look. To take a thermostat out the engine maby stay to long cool. While driving around. Operation temperature take to long before it's reached the right temperature. And cost u more fuel. Good luck finding a solution.

varesecrazy said:

unbolt the hose union by oil filter, and check it drains down o.k.



Charlie

Click to expand...

Hi Charlie, stupid question... will the slow flow of oil through the system cause the temperature to increase?

There is a leak near the bottom hose at the oil filter. This is the hose that runs to the oil cooler.


Hugo

Here are a couple of pictures of what it looks like near or at the oil filter/cooling pipes. The oil cooler itself is fine and there are no leaks. I also checked it after a short trip this morning and it's fine... warm and everything This pic shows it from the top, the rest are taken from the bottom. I assume this is the power-steering and its oil leaking.This is the pipe below the one showed in the first picture. Lots of oil leaking out/forced out. The next is a closer view of the bottom pipe. Notice the oil going down the oil filter. The oil filter is tight though.


Hugo