Technical Car/Motor Issues > Ford Mondeo III - 03 2000 Running cold Specialists
Thread Author: Pat Replies: 8
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New Mon 2 Jan 12 04:10 
 Ford Mondeo III - 03 2000 Running cold - Pat
This is our first winter with the Mondeo and we had noticed the last few weeks that the temperature guage is hardly moving from cold.
It had only been used for 12 mile open road trips to and from work so thought it was just the early morning cold ambient temperatures.

Yesterday we had a trip to Kent and the temperature guage still hardly moved. We noticed that the average fuel consumption is down to around 46MPG from around 50mpg after 3 hours of motorway driving.

No other symptoms at all which is puzzling but it's still worrying.

Should we be worried? If so what's likely to be wrong?

Is this a normal working temperature for a diesel Mondeo in colder weathger?

Your opinions would be appreciated. TIA

Pat
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New Mon 2 Jan 12 04:23 
 Ford Mondeo III - 03 2000 Running cold - Lygonos
Fair bit of interweb info re. this, not least from HJ's site.

Could be thermostats, could be normal for Mondeo diesel when the heater is being used due to high engine efficiency not producing enough waste heat.

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New Mon 2 Jan 12 08:37 
 Ford Mondeo III - 03 2000 Running cold - Hard Cheese

I recall that mine ran cooler in the winter though I cant recall exactly re the guage. However I rememeber discussing it on HJ so will try to search there later.

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New Mon 2 Jan 12 09:15 
 Ford Mondeo III - 03 2000 Running cold - Iffy
Mine - 2.0 diesel, although a different engine to Pat's (I think) - will reach usual temperature on the gauge, but takes a while to do it in winter.

Diesels in general run cooler than petrols.

If you lift the bonnet of mine in summer, there's no gust of hot air, which there is from some petrol engines.

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New Mon 2 Jan 12 09:34 
 Ford Mondeo III - 03 2000 Running cold - carmalade
There is a small thermostat that fits into the back of the water pump housing.This seems to be the most common cause of cool running on these diesel engines.hth
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New Mon 2 Jan 12 10:33 
 Ford Mondeo III - 03 2000 Running cold - Hard Cheese
>>
>> I recall that mine ran cooler in the winter though I cant recall exactly re
>> the guage. However I rememeber discussing it on HJ so will try to search there
>> later.
>>
>>
>>

Cant find it, as I recall it hit about 1/4 in the winter and just below half in the summer.

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New Tue 3 Jan 12 04:02 
 Ford Mondeo III - 03 2000 Running cold - Pat
Thanks Carmalade, that information is something we wouldn't have known and seems to be the cause of the problem.

I found the BR post Cheddar and that was informative too.

We now know it's time to do something about it but the problem is going to be avoiding the Ford main dealer usual route of changing the two other thermostats, with related labour charges for each individual job, before finding the problem is actually the one carmalade describes above.

Would it be worth going to our trusty indy and haveing the water pump thermostat done first?

Pat
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New Tue 3 Jan 12 08:22 
 Ford Mondeo III - 03 2000 Running cold - bathtub tom
>>the two other thermostats

Has this engine got three thermostats - sheesh!

I can't really understand why more than one's required.
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New Tue 3 Jan 12 21:23 
 Ford Mondeo III - 03 2000 Running cold - Dave_
Mine would behave in the same way on your commute Pat - in temperatures of around 2°C it takes 4 or 5 miles to put any warmth at all through the air vents, and 20 miles for the temperature gauge to reach the middle. In the recent "warm" spell when the temperature got up to 14°C however, it warmed up from a cold start in no time at all.

I would tend to agree with Lygonos that the TDCi naturally produces very little waste heat. Ford must think so too, as the front and rear heated screens are programmed to come on for 5 minutes* automatically when the engine is cold started in ambient temperatures below 4°C.

>> Has this engine got three thermostats - sheesh!
>> I can't really understand why more than one's required

I've no idea if it has, yet. Still not needed to invest in a Haynes manual :)

*Normal timer for the rear 'screen is 10 minutes, but both screens self-cancel together in the above situation.
Last edited by: Dave_TDCi on Tue 3 Jan 12 at 21:24
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