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Temp variation 

 

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 Post subject: Temp variation
Posted: Wed Dec 15, 2004 6:18 pm 
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I have a 6cyl el fairmont ghia and ever since the head was done and the radiator reconditioned the temp has been going from M down to L on the temp guage whilst driving. the thermostat has been replaced and doesnt overheat. does anyone have any ideas on what the story is here???
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Posted: Wed Dec 15, 2004 7:32 pm 
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my ea does the same,,the temp will suddenly go just over half then drop down again,,have been told it's harmless,,been doing it before and after doing the head gasket

 

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Posted: Wed Dec 15, 2004 8:04 pm 
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it may be harmless but if u just assume its going to go down and oneday it doesnt well thats not going to be a good thing! it wasnt doing it before the head was done and sat between A and M.
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Posted: Wed Dec 15, 2004 8:23 pm 
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you could be right..but try and find someone who'll say it's not right,been there done that..

 

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Posted: Wed Dec 15, 2004 8:47 pm 
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On a hot day It will stay around the M and A for me, if its a REAL fkn hot day it will go up just alittle more.

It goes down for me when i start moving and air passes thro the engine, and also it will go down if i stay in the same spot for alittle while.

 

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Posted: Wed Dec 15, 2004 8:49 pm 
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i fits droppin why are you complaining lol, its prob just caus its in good nick and when ure getting alot of air into the radiator it dropping the temperature
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Posted: Wed Dec 15, 2004 11:05 pm 
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yeah but when its droppin just under the L from M whilst doing 100kmh wont the air fuel mix change, as if the engine is from a cold start.
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Posted: Wed Dec 15, 2004 11:58 pm 
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On the EA, i'd almost definately say it would be the fan hub is worn and needs replacing.

I experianced this when my head went and a while after, it stopped.

The only logical explanation for this i could come up was that the oil in the cooling system from the blown gasket was getting stuck on the sensor and was holding a higher temperature than the coolant raising the temperature. then when the flow of coolant pushed the oil on, the temperature went down. (thats my theory, it's prolly a load of BS)

you might wanna try putting a small hole in the thermostat (bout 3-5mm) this might allow a better flow to the thermostat so it opens quicker.

I certainly would not conclude that it is nothing before completely going over the cooling system for problems.

 

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Posted: Thu Dec 16, 2004 12:54 am 
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How about, when it gets to whatever your thermostat is, say 90, it opens all the way, and hence the drop in temp, sounds good to me.

 

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Posted: Thu Dec 16, 2004 1:38 am 
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Ok how come some cars temp gauges never move around so much?

With my EL falcon and EB falcon the temp is allways going up and down, if your driving on an open road or city drving the temp gauge will allways go up and down.

On some cars , My old XF falcon , my mates 1992 model 5 series BMW , and another mates nissan pulsa , when the temp gets to its normal temp it remains solid and never moves up and down, even if your thrashing around or driving slow, it will allways have a steady temp showing.

It seems that fords allways have very sensitive temp gauges

is this true?

 

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Posted: Thu Dec 16, 2004 1:46 am 
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all i can think of is that the radiator is cooling better than before and when the thermostat opens its super cold water being pumped in, ill just have to bare with it...
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Posted: Thu Dec 16, 2004 1:48 am 
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I would think that it wouls also depend on the condition of the cooling system, a nice clean radiator would allow maximum flow, the thermostat opens gradually, with maximium flow the coolant would heat up evenly, and not show a great drop etc, if the thermostat was stuffed, or cores clogged, more pressure would build up, and make more of a fluctuation, on the temp gauge, some of my cars have done this, some havent, thats my guess anyway.
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Posted: Thu Dec 16, 2004 8:35 am 
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If ur using a genuine ford thermostat p*** it off and try a Trident one.

 

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Posted: Thu Dec 16, 2004 10:42 am 
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as i said before my temp goes up and down all the time and i have been told by ford and by a radiator specialist thats it's nothing to worry about and it's the thermostat doing it's job..

though i will need to replace the fan clutch shortly

 

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Posted: Thu Dec 16, 2004 10:56 am 
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joolz wrote:
all i can think of is that the radiator is cooling better than before and when the thermostat opens its super cold water being pumped in, ill just have to bare with it...


I had this problem on my previous car , an EA and I came to the same conclusion, though mine stablised on longer trips.

 

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