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Old 13-01-2015   #1
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FIAT SIENA 1.7TD overheating

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?!Click image for larger version

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Hugo
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Old 13-01-2015   #2
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Re: FIAT SIENA 1.7TD overheating

( 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
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Old 13-01-2015   #3
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Re: FIAT SIENA 1.7TD overheating

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Last edited by Peter Pick-Up; 13-01-2015 at 22:15.
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Old 14-01-2015   #4
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Re: FIAT SIENA 1.7TD overheating

Quote Originally Posted by varesecrazy View Post
( 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

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
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Old 14-01-2015   #5
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Re: FIAT SIENA 1.7TD overheating

(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. Click image for larger version

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Old 14-01-2015   #6
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Re: FIAT SIENA 1.7TD overheating

It's less than gbp 40, incl. shipping....???
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Old 14-01-2015   #7
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Re: FIAT SIENA 1.7TD overheating

Quote Originally Posted by theonlynapsta View Post
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
Hi,
check the oil cooler for function,

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

Charlie
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Old 14-01-2015   #8
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Re: FIAT SIENA 1.7TD overheating

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....
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Old 14-01-2015   #9
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Re: FIAT SIENA 1.7TD overheating

Quote Originally Posted by varesecrazy View Post
Hi,

check the oil cooler for function,



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

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



Charlie

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
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Old 14-01-2015   #10
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Re: FIAT SIENA 1.7TD overheating

Quote Originally Posted by Peter Pick-Up View Post
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....

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.


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Old 15-01-2015   #11
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Re: FIAT SIENA 1.7TD overheating

Quote Originally Posted by theonlynapsta View Post
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
unbolt the hose union by oil filter, and check it drains down o.k.

Charlie
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Old 15-01-2015   #12
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Re: FIAT SIENA 1.7TD overheating

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


Hugo
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Old 17-01-2015   #13
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Re: FIAT SIENA 1.7TD overheating

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.
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Old 19-01-2015   #14
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Re: FIAT SIENA 1.7TD overheating

Quote Originally Posted by varesecrazy View Post
unbolt the hose union by oil filter, and check it drains down o.k.



Charlie

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.


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Old 19-01-2015   #15
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FIAT SIENA 1.7TD overheating

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 everythingClick image for larger version

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ID:	148637 This pic shows it from the top, the rest are taken from the bottom. Click image for larger version

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ID:	148638 I assume this is the power-steering and its oil leaking.Click image for larger version

Name:	ImageUploadedByFIAT Forum1421693472.549781.jpg
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ID:	148641This is the pipe below the one showed in the first picture. Lots of oil leaking out/forced out. Click image for larger version

Name:	ImageUploadedByFIAT Forum1421693378.467453.jpg
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ID:	148639 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
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Last edited by theonlynapsta; 19-01-2015 at 18:56.
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