Overheating
 

I thought I posted this already but it never showed up.
Take 2

I have a 2002 PT Cruiser that overheats.
After reading many threads, so far I have:
- replaced the radiator fan housing
- replaced the coolant temperature sensor
- replaced the thermostat
- replaced the low speed relay
- replaced the high speed relay
- checked the reservoir and hoses to make sure there is no clogs
I should note that when we got the car the radiator fan connector was damaged, so I have butt-spliced (solder) the wires together.

I drove it yesterday and it seemed to do well, I went about 10 miles in city (lots of red lights) and highway. It never got close to halfway on the temp gauge.
When I got home I let it sit awhile and it eventually got to the center of the temp gauge, but no higher. The fan never came on.
I forced the fan on by turning on the AC and it did come on and work (low speed). But I have not heard it come on high speed.
When I turned it off, some coolant gurgled out of the reservoir..

What else to check? maybe a new radiator cap?
Is there a way to force the fan to high speed to check and see if it is working?