Temp going down then back up again?

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jimbo-td5

New Member
Posts
231
Location
Gower, near Swansea
Ive noticed recently a few times where my temperature gauge is dropping from half back to quarter for a while then rising back up, what could be causing this??
Thanks in advance!
 
When I had mine MOT,d this year, ( Jan ), after the car had been stood running for 15/20 mins, ( while the emmisions were tested ), the temp gauge went back down to the quarted mark.

Had,nt done it before and has,nt done it since !.

Del.
 
It could do it a few times but ive only noticed it once reversing onto my drive and today driving along a dual carriageway i looked and it was down, i looked again after about 10 secs and it was back up (steering wheel blocks my view). Ive just checked the water level and theres plenty of water in it and no signs of water/oil mixed so im hoping its just a thermostat!
 
see if this makes sense, when you first drive discos the gauge goes slowly to about quarter, then quickly up to half when the thermostat opens. when my gauge falls back, its landing in the position where im assuming the thermostat is closed, then rises back to the middle (thermostat open) after a few seconds so it sounds to me like the thermostat is unecesserily closing, then opening again, pointing to duff thermostat?? or am I wrong?? anyone?
 
I know someone with A diagnostic computer, dunno if it does LR though, Ill give him a ring! Just wondering could it have anything to do with a bar seal that I used about about xmas time? I had a small coolant leak around the diesel preheater (I think it was) and it cured it!
 
I know someone with A diagnostic computer, dunno if it does LR though, Ill give him a ring! Just wondering could it have anything to do with a bar seal that I used about about xmas time? I had a small coolant leak around the diesel preheater (I think it was) and it cured it!

Does it seem to alter as and when your revs exceed 1500rpm?
 
I gave it a good going over on the weekend and there seems to be nothing pointing to HG or overheating, the fan is fine, the water level is clear and correct, the oil is fine, driving with the heaters on flat out when the gauge plays up makes no difference to the temperature, and ive noticed a few times its starting to do it when i come to a standstill. i drove it about 7miles in country lanes and it didnt do it, but as soon as i pulled in a mates drive it dropped slowly, i drove off and it came back up. I stopped at another friends and it slowly went down again. I then went home and when reversing onto my drive i notice it start to move slightly again!
will this info shed any more light for anyone?
thanks to all thats helped so far!
 
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