Ok .. well I have a 1995 Mazda 626 4 cyl engine... the car still runs as of now and am not sure wat the problem is. At first it would have a hard time starting as if the battery was bad. So i got the battery tested and it was good. Then for a while i had no problems till it started idling low while at stop lights and while tryin to crank engine. The car still ran so being the only car i have i continued to drive it. then one day on my way to work the radiator busted and that got replaced. so now there is a new radiator. Then the 2nd day it was fixed my car continued to run hot so i pulled over and noticed my one of the dual fans wasnt comin on. i tried switchin the relays to see if that was the problem .. obviously tryin to start with a cheap solution and work my way up.. so since then the car hasnt really been driven .. only to my apt complex where is it waitin to be fixed. I want to know if anyone knows y it may be idling low so i can fix all issues at the same time? I start the car every few days to keep the battery startin and it starts fine just idle goes down below one when put in any gear other than park... any suggestions about this issue will be helpful .. thank you!!
-ashley

You can start with cleaning the throttle body, if they get dirty enough it can cause the engine to idle low or even die at idle. Get a can of throttle body cleaner and a little brush, take off the air intake tube, open up the throttle and clean it, don't spray too much down the body without start the engine once in a while or you can flood it out

Ashley; Your computer depends upon a constant 12V for it to function. If the battery/charging system drops below that point, it will go into what's called 'Limp home mode'. The engine will 'run' but not very well. The computer relies on information from various sensors to control fuel delivery. The Coolant temp sensor is a very important one. If the coolant level gets low, it will 'tell' the computer that the engine is cold, whether it really is or not. If the engine got hot when the radiator 'blew', it is possible that the thermostat was damaged and/or the sensor. The cooling fans are there for two reasons. The main fan comes on when the engine reaches a specified temp, usually around 230F. The auxilary fan will come on when you have the heater/AC control set to defrost or A/C.
Back to the radiator; The coolant temp sensor must be in physical contact with the coolant/water. Hopefully, this isn't the case, but if you got the engine hot enough, you may have damaged the head gasket which will allow exhaust gasses into the cooling system, resulting in air pockets which will give the CTS erroneous readings. And, overheating issues. Again, hopefully, this isn't the case.
Loren
SW WA