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Old 08-03-2007, 02:06   #1 (permalink)
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apparent overheating

I have a Ford fiesta y2000.

2 weeks ago The temperature gauge indicated overheating, the needle moving for the first time above the halfway point in the 2 years I have owned it. I went to the garage, coolant was low and was topped up. The garage advised it was ok.
I've noticed since that after between 20 and 30 minutes driving the temperature needle goes into the red box. I've taken it back to the initial garage twice and again to Ford garage but they advise nothing is wrong, and that the needle never goes above midway during their checks.

Yesterday I took 2 40 minute journeys

The first journey I tried to manage the apparent overheating by having the heat on full blast. The needle stayed in the red box for the second half of the journey. When I opened the engine it seemed cool enough.

On the return journey I turned the heat off and left the setting to cold. The air coming through was quite hot and there was a smell coming with it. The needle stayed in the red box for most of the journey and when I opened the engine afterwards it was much hotter then after the first check, and there was a gurgling noise from the engine. There was a 30 minute gap between the 2 journeys

Any ideas? I'm at a loss as to what to do because the 4 trips to 2 garages have shown nothing up in their checks but I don't feel confident taking it on long journeys.

many thanks

Kerrie
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Old 08-03-2007, 11:46   #2 (permalink)
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Re: apparent overheating

Doesn't sound like it's actually overheating, so most likely the temp sender is faulty.
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Old 08-05-2007, 07:55   #3 (permalink)
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Re: apparent overheating

thanks. I noticed yesterday that the coolant level was back to minimum. It was topped up to max 3 weeks ago. I've driven about 40 miles in those 3 weeks and 2 garages have said there are no leaks - where else can it go? I will try another garage.
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Old 08-05-2007, 10:09   #4 (permalink)
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Re: apparent overheating

Is there any white smoke from the exhaust?
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Old 08-07-2007, 04:47   #5 (permalink)
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Re: apparent overheating

Quote:
Originally Posted by kerrieoc
thanks. I noticed yesterday that the coolant level was back to minimum. It was topped up to max 3 weeks ago. I've driven about 40 miles in those 3 weeks and 2 garages have said there are no leaks - where else can it go? I will try another garage.
Hi
Just wanted to let you know that we've found a number of Fiestas and Focus leaking through the coolant tank cap. No signs of leaks are evident because they are relatively small leaks but the car will work hotter than normal due to reduced cooling system pressure and in some cases you can actually see the coolant boil just before the fans kick in. cheers
Marc
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Old 09-07-2007, 13:13   #6 (permalink)
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Re: apparent overheating

thanks. I got a mechanic to look at it. He changed the following and it is now working fine

- new thermostat (this was the first thing he changed and it made no impact on the problem)
- new radiator, the old one was clogged up and he couldn't clear all of it
- new water pump, there was a small leak that the garages had not picked up on

The 2 above improved a little but it was a problem with the heater that was contributing most. Once he fixed that it was fine
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Old 10-09-2007, 16:01   #7 (permalink)
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Re: apparent overheating

when you say it was the heater thats where the problem was do you know what he done to the heater, did he say any thing like it was a block in the heater matrix?

also did the heater in the car get hot?

only asking as i think i may have a similar problem my father has just given me his 1998 fiesta i drove the car tonight to friends garage to look at another problems that seams to have disappeared now and noticed while i was driving up (about 30 miles) the needle was about 3/4 up the gauge but while the car was on the ramps idling for ages it didn't go over 1/2 up the gauge and then i noticed again on the way home it got close to the red when i parked the car. i was thinking on the way home thermo stat (if I'm lucky) or head gasget may be.

if i had a air block in the matrix this could make sense as i managed to break a part on the car about 6 months ago (before it was my car) when i brushed against the pipes that come out of the heater matrix up to another funny sensor on the bulk head.

anyway I'm new to the site so hello to everyone. I'm not new to fords tho i have had loads of escorts and still have two escorts on the road (one is about to go now i have the fiesta) I'm just amazed at how basic this fiesta is the car is a GHIA and theres no light in the glove box, no variable speed intermittent wipe and you cant adjust the steering wheel oh well at least its got aircon which the escort its going to replace has not.
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Old 10-17-2007, 17:01   #8 (permalink)
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Re: apparent overheating

I'm still having problems with my fiesta with over heating.
when the car idles everything is fine temp gauge is 50% up the gauge.
when the car is underload i.e you are driving on a motorway for while the temp gauge goes into the red.
what i am noticing now is when it goes in to the red on the temp gauge the heater in the car goes cold.
i know this sound strange but this is what is happening.
can any one tell me what this sensor is and what it does that i have put a red circle around (those pipes plug into a sensor before they plug into the heater matrix)
http://www.fordforums.com/attachment...1&d=1192664082
Attached Images
File Type: jpg FIESTATEMP1.JPG (56.0 KB, 19 views)
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Old 10-18-2007, 01:06   #9 (permalink)
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Re: apparent overheating

Hi Nick
The only way that the problem you describe will happen is if there's no coolant flow. If the car overheats at idle this usually means thermostat or fan, but in your case the problem happens only on the freeway, right?, and this means either your radiator is blocked or the water pump has failed.
On the picture, what you circled is not very clear, but it looks like the heater tap or heater valve, which is there to open and close coolant flow inside the cabin (when you select "cold" or "hot"), but this has no weight whatsoever in the cooling system, even if its totally blocked, your cooling system should still work ok, as there are by-pass hoses around the system. Kerrioc was probably referring to the radiator when she said the heater in that post.
There's a simple test you can do that will tell you if this is your problem. Get the car warm and feel the radiator core to see if there are hot and cold patches through the whole area. Remove the fans if you need to. And the car doesn't have to be running. A normal radiator should feel hot to the touch on the inlet side and should get colder gradually as you run your hand towards the bottom near the outlet hose. If you feel cold and hot patches in different places this means it is blocked. If it feels ok, then go after the water pump, which could have worn or loose blades that will give you a shitty or nonexistent water flow. hope this helps. cheers
Marc
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Old 10-21-2007, 12:16   #10 (permalink)
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Re: apparent overheating

i think i fixed it !!!

many thanks for you reply Marc i was thinking water pump myself after reading your reply, but it was a blockage in the control valve. the pic in my last post.
i had broken this valve a while ago while trying to get to the speedo sensor i was told at ford that those frequently go wrong when i went to replace it but what i didn't know was when i broke the first control valve a little bit of the plastic pipe had fallen into the pipe and was in the coolant system, this had got stuck in the value blocking 3/4 of one of the pipes.
if anyone else ever gets a problem like this its easy to check this valve with out buying a new one. you can just bypass it with some copper pipe, the heater controls in the car will stay on hot even if you select cold its still comes out hot but it gives you chance to test if this is your problem.

a freind of mine who owns a garage looked at the car also before my last post and was not sure what the problem was but phoned Ford technical (not sure who they are) and the list they gave to change was:
1)control valve
2)thermostat
3)water pump
4)radiator.

just hope this may help anyone else if they get the similar problem.
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