All cyclinders read 150-155 PSI. I had the waterpump and thermostat changed at 90k miles with Honda parts. It's now done 135K
I've been losing water for some time, through the expansion bottle but I just top it up. This time it it came out too fast.
The rad. hold water no signs of a leak anywhere.

If it's the fan sensor, then I'm assuming the fan won't come on at all. By the way where is the sensor? Is it in the rad? As I mentioned eariler, I've been losing water for some time.