can someone help, every time i boot the car the temprature gauge goes down and when i ease off it goes back to normal,any ideas:no:

Thermostat not closing?

sure your not looking at the boost gauge! lol try check the connections see if they are loose.

 

dan.:biggrin:

i think its electrical because the car never over heats and gets to normal running temprature normal thanks anyway.

check the connections/wiring on the 2 sensors on you top metal water pipe coming out of the front of the engine to the top of the radiator, one of them is the sensor for the gauge (always forget which one), one has a spade connector riveted to the top of it, check that isn't loose, if it is, a flattened nail or something similar and a few taps with a hammer should tighten it up, but check the plugs too for any green crusty gunk and clean off... may help...

dont have complete confidence in the standard temperature guage they are notorious for being wrong! mine was reading normal with a fried engine and so much steam i couldnt see a thing!

 

dan.:biggrin:

tis true, they are not the best, they don't rise as fast as the engine temperature if something dire happens, but as his is dropping down when he boots it, that sugests to me that as the engine moves under load, there is a dodgy connection, the gauge is losing it's signal, dropping down, then when let off, the engine moves back and it re-connects. I also have an aftermarket gauge tho, boost, water temp and oil pressure are a bit of a must really me thinks :)

tis true, they are not the best, they don't rise as fast as the engine temperature if something dire happens, but as his is dropping down when he boots it, that sugests to me that as the engine moves under load, there is a dodgy connection, the gauge is losing it's signal, dropping down, then when let off, the engine moves back and it re-connects. I also have an aftermarket gauge tho, boost, water temp and oil pressure are a bit of a must really me thinks :)

 

second that boost, water, oil temp and oil pressure for me.

 

dan.:biggrin:

i think its electrical because the car never over heats and gets to normal running temprature normal thanks anyway.

 

Why would you expect it to overheat?:confused1:

 

It wouldn't if the thermostat was stuck open. And as you increase road speed, the increased airflow through the rad and over the motor would cool at a faster rate (hence the temp drop) especially in the cold weather. When you slow down, the temparature would then rise back into the normal range.

 

This is assuming the drop and rise happens over a minute or so, and isn't an instantaneous thing - in which case I would go for the dodgy connections.

thank.s everyone will check connectors

second that boost, water, oil temp and oil pressure for me.

 

dan.:biggrin:

 

I would like an oil temp gauge, but got the other three in the DIN slot, so I've got no-where to stick it (no suggestions please:) )