Here's what's happening: I go on a long trip (more than one hour) in my 2005 Honda Civic. I pull off the interstate, and the temp gauge quickly goes up. Within three minutes, the gauge is pegged in the red, especially if it's a hot day and I'm stuck in slow moving traffic. If I can keep the car moving, the temp goes down. I run the heater to try and dissipate the heat, but the blown air is not hot -- sometimes, it's even cold. The last few times this has happened, I know I've run my AC before getting off the interstate, but I don't remember if that is always the case. This may be happening without AC running at all, and I always turn the AC off immediately after slowing down.
I've always been able to park and let my car cool down before anything bad happens, or I get back on the interstate and the air blowing through the radiator cools the car back down. The fluids and fuses both seem to be fine.
Is the thermostat toast? Is there a clog in the hoses? Is the fan on the fritz?
Help! I bought this care for it's longevity -- I don't want to kill it before its time.
Thanks in advance