I notice every time I use the heater or air-conditioned my car overheats

I'm, stumped! My car overheats only when I have to stop,as long as I'm moving its good,I know its the wiring to the fan,because when I wired it to a toggle switch, absolutely no problems even with the a. C on full blast,and being over 100 degrees outside! Anyone, have any ideas? Thanks,and God Loves you!

Overheating but there is no oil in the water and it does not smoke I've replaced the thermostat thermostat housing cooling fan fan relays and still overheats?

Bought this 05 cruiser from a snake oil salesman from a craigslist post of $2985.00 with who claimed it would last me a long time as long as I took it easy. Instantly dismissing the shaking that I felt in the steering wheel at approximately 30+ mph from the first test drive. Said oh that lil shimmy, it's no biggie I just drove it to ___ (city 1hr away) and it drove fine. Then the very last thing he showed me before I drove away in my newest craigslist investment was how the ignition would lock the key unless I jiggle thr gear shift (then it releases the key it like a normal ignition does when… Read complete