it would increase from 180 to 210/215 in no time at all, all in about 45 seconds, and that was last night with the air temp around 70.
Is the upper rad hose hot? If so the water pump wouldn't be the problem. You had this problem before doing the work correct?
Did you make sure the fan is spinning? Also make sure the rad isn't super dirty. If theres alot of junk up front then airflow might not be getting through the rad to cool off the coolant.
like I said earlier, a faulty rad-cap could cause issues also. Don't discount it. the rad cap is more than just a cap - it holds pressure and releases it as needed.
keep us posted on the progress.
bdub, i looked at your mods again and I pretty much have the same thing. the reason I was asking if you had the black magic fan is that it is adjustable, as you probably already know. the setting isn't completly consistent. 2-3 times this year I have had to adjust the knob (the engine was getting hotter and hotter and the fan wasn't kicking on until it got much hotter than I was comfortable with. It takes some playing with until you get it right - and even then it will almost certainly have to be adjusted again in the not-so-distant future.
I had a mystery cooling problem a long time ago, anyway it turned out to be a warped radiator cap mounting flange. I would buy new caps and they would work for a while, then they would eventually warp and cause mystery cooling problems.
I even used one of those cooling system pressure testers on the car and it seemed ok, but naturally the pressure tester didnt stay on radiator long enough or go through the heat cycles to let it warp.
If your fan is a Black magic, did you mount the temp probe near the upper radiator hose? It gets the best temp readings in that spot.
This is per an aftermarket gauge?
Did you happen to use a turkey thermometer in the rad neck while burping the system? This can help check a gauge's calibration (one has to be very careful of being scalded with hot coolant however).
Since it occurs at idle and speed, to me that suggests either a gauge or t-stat issue as being most likely. If you haven't, try going with a balanced t-stat (the balanced part means they open more consistantly).
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