1995 chevy lumina temp. reading

could be bad temp sender on block.

This means you car is running for a while or not?

Whats about heating, there are any changes?

Regards,

Ralf

I'd swap out the sending unit before anything else.

--scott

I, too, have a 95 Lumina. Had the same prob. U have air in the cooling system. To correct...1. Idle car with rad cap off and radiator full.

1. Allow temperature to rise until thermistat opens,(allowing coolant to circulate thru the entire system.) As the coolant level drops in the radiator add coolant as necessary to completely fill the system. Do all of these procedures with the heater on. This is sometimes a bit messy as coolant sometimes wants to bubble out of radiator just prior to the thermistat opening. I loosely keep the cap on to prevent much of the over spill. Also, u might be quite surprised as to how long it takes to heat up with the radiator cap off, so just be patient. I think mine took 30 mins - 45 mins. Its necessary for u to be in position with the antifreeze at the time the thermistat opens as, once again, this is the time that you'll put it in. U might have to do this procedure a couple of times before your system is completely up to capacity. One last thing, There is a bleed screw on top of the thermistat housing. Sometimes after intial start, the system with heat rather quickly as observed on the temp gauge. If you were to check the upper rad hose at this time, u'll notice it is under pressure. Relieve this pressure with the bleed screw while running and hot. You'll probably have to do this a few times also. Good luck ...Jim

The Problem was the temperature sensor. Thanks to all for your help