Casper 993

I was letting my engine idle to check if my coolant fans turn on at the correct temperatures. The coolant temperature levels out at 201° on the digital readout and it was one tick below the 220° reading on the analog gauge. So that would mean each small tick on the analog gauge is 20°. The range of the gauge is from 100° to 260°. So doing the math backwards that means the bottom reading for the coolant is 60° which would be not match the 100 and the same for the max temp. Does the gauge go in increments of 5° above 220 like our speedometer changes tic values after 100 mph? My car is up on stands so I can't just drive it around and check it but I just noticed it and all of the other gauges are linear. Could this be a sensor problem or just how the analog gauge works?

Eshoremd

I read it as the analog gauge reads 205. I never noticed that about the speedo.

C5MSG2004Vert

The temp and speedometer sweeps are not linear. The temp gauge below 220 is 15 deg f per minor tick. Above 220 it is 5 deg f per minor tick. I think the temp gauge is in pretty close agreement with the digital gauge and looks to be within a few degrees of the digital reading. I think they did it this way because the sweep of the gauge would be too large if a linear scale was used and it allows greater fidelity of the reading in the areas where the gauge reading is used.

jcgunn

That looks like a normal gage reading to me.

vette4fl

Mine does the same thing. The analog gauge is more a guideline than an exact reading, regardless of the gadiations. .The digital temp is pretty accurate.

ThomasR

Looks normal to me. The coolant temp gauge is not linear as said before.