1995 Buick Skylark overheating

[quote:89d5710bee="nmillian"]Other Category problem
1995 Buick Skylark 6 cyl Two Wheel Drive Automatic 225000 miles
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i have a 1995 buick skylark. recently my temp gauge constantly goes up and down. it will go up, stay up for a minute then will go down. when it goes up the heater goes cold, then when it goes down the heater is warm. a few times my temp gauge has come on and have had to park for a few minutes for the temp to go down. it is like a switch. it instantaniously goes down. i have replaced the thermostat twice and the problem is still there. in the past 3 years i have replace the radiator, heater core, and water pump. can you help me. someone suggested the fan is out.[/quote:89d5710bee]

hello,first of all if u wanna chek if the fan turns on just turn on the air conditioner and the fan should start.if it doesnt then possibly u need a fan motor.or relay sensor.these cars have the 3.1 v6 i beleive.you must use antifreee on these cars not water alone.try it by using 60 coolent 40 water or just buy a 50/50 coolent .if u dont put the right amount of coolent in the system the temp needle will do odd things like read overheating when its not over heating etc. believe it or not .and sometimes with just water they will start to leak from the resorvoire weird but true.after u fill it up with corect coolant the car will keep doing the same thing for a little while or days but keep driving it and it will stop suddenly.it is also good to use antifreeze alone with not much water and its better.and when ever the car needs coolant just use coolant not water to fill.these motors require coolant ,not like the old cars where u can use even water alone lol.good luck