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Discussion Starter · #1 ·
well i did cooling system overhaul and replaced lot of parts but some how electric cooling fan dont come on when engine is normal or high temp? how can i tell its not burned up or how can i test this problem? i reall dont want to spend over 300 bucks for new fan. :cry:
 

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Discussion Starter · #4 ·
ok what color wires do i hook up where to test this? and i checked 50amp fues looked alright but had brown tint on both teeth.? and some one told me When AC is on electric cooling fan should always come on is this true???
 

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Discussion Starter · #6 ·
No, only comes on when the coolant is too hot. If the belt/viscous clutch fan is moving enough air (assuming your car has auto transmission), electric fan won't run. See your "what's this wire for" thread for an explanation of the coolant temp sensor found in the radiator.
well i did check coolant temp sensor it is pluged in (lower radiator hose) this little wire is on driver side by head light and dumper. and i do know electric cooling fan comes on when it gets hot. i did run the car almost to the red line on engine temp never came on. so i shut the car down to cool the engine because i didnt want to blow head gasket.
 

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Discussion Starter · #9 ·
haha sorry i am new guy to bimmerfest lol well i by passed heat sensor to test electric fan made sure it worked and it was also 2 speed fan one at idle and one at full speed. than i check the lower radiator temp sensor like u told me to after engine was at 200f it was cold Thermostat did not work so the heat sensor was reading cold because Thermostat never opened up so i have to order new Thermostat. so that was why fan never came on and didnt have good flow to radiator to get cooled and that is why i had heat problems. but i did learn lot from u all. thanks again
 

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Discussion Starter · #11 ·
Well this car was great deal because of the price and it came with tools and most of new cooling system parts still in boxes but it came with 2 thermostat open box so i just put one on when i was putting it back together. was not sure witch one was the new one. so ya lot a cooling system part was replace just Thermostat was open box and when i bought the car lot of the parts were just sitting in the trunk and found 2 Thermostat so got a try both before i buy another one and seller move out of state so i cant even return the new Thermostat for new one.
 
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