Temperature gauge play when I turn on my ac fan speed

Post Wed Jan 02, 2013 2:15 am

Hello,

I have another issue with my car, anyone know why the temp gauge go/move to right, if I turn on my AC fan speed to position 1 and go far to more right when on position 3?

but when I turn off the AC fan the temp gauge go back to normally again,

also when i try to open my window, it make my engine a little bit rise/low rpm?

Thank you

Post Wed Jan 02, 2013 7:06 pm

also when i try to open my window, it make my engine a little bit rise/low rpm

Extra load put on alternator......

Post Thu Jan 03, 2013 12:29 pm

kam-325i wrote:
also when i try to open my window, it make my engine a little bit rise/low rpm
Extra load put on alternator......

what cause this? does my alternator is defect? weak? or my earth cable is loose?

Post Thu Jan 03, 2013 1:07 pm

The dropping revs thing is pretty normal when extra load is forced upon the engine, it won't stall the car or anything.
When the windows are up push the button to put them up and the revs should drop a little and you'll see it there.

Unsure about the Aircon though as I don't have it in an E30 but it my civic it never changed the temp, maybe you could do with a coolant change?

Post Thu Jan 03, 2013 9:37 pm

My project 318 is with a m20 2.5 does the same when i turn on the heater fan.
I aslo like to kmow what is causing it so will watch this with interest.
I have a bulb out on the cluster so i'll check the nuts on the back of it tomorrow to see if thats the cause.

Post Fri Jan 04, 2013 4:43 am

or may be less earth for the temp gauge? so it is not stable? do you know where the earth should be contacted?

Post Fri Jan 04, 2013 8:20 am

On the back of the speedo cluster are brass nuts.
If they are loose it causes issues so hoping thats all it is..
But its the first time i have seen this problem.

Post Fri Jan 04, 2013 3:53 pm

thank you shedrool83, you mean in the very back of the speedo so it will contact with car body or or the brass nut is in the speedo?

How the brass nut get contact with the car body(earth)? it connect with wire/cable?

Post Fri Jan 04, 2013 4:25 pm

Brass nut is on the back of the speedo guess it connects to the board in the speedo then through on of the speedo plugs.

I did mines today .I had a few bulbs out in the speedo so i tighten the nuts (1 for fuel gauge and 1 for temp gauge) I'm still getting a slight movement on the temp needle when i turn the fan on to 4 .
But its very little now.

Before it moved about 2 needle thickness.

Can't be sure if what i done today fix it as the nuts only took a small tighten .
Dont know if a few bulbs out would have had anything to do with it either.