I heard that when I stop or low idle then aux. fans are supposed to come on to cool off the engine not just when A/C is on. Is that true? I have 93 Mercedes 300E. My aux. fans never come on. The reason I'm asking is because my car temp. goes up to ~100^C when @ low idle. When on freeway the temprature drops to ~85^C. Let me know if you think aux. fans could be the problem. My A/C also doesn't work.
2007-07-30 10:56:48 · 3 answers · asked by acidburn3006 1 in Cars & Transportation ➔ Maintenance & Repairs
it should come on at the right temperature ,if it doesn't the car will over heat,but if never gets hot enough ,the auxiliary fan wont ever come on this much,they usually come on when the temperature goes well above 190 on it,good luck with it.
2007-07-30 11:02:05 · answer #1 · answered by dodge man 7 · 0⤊ 0⤋
The temp sensor that turns on the AUX fan does so at 100c or slightly higher if the fan does not run the a/c won't perform well at low speed and high temps. A good reason your aux fan does not work is the A/C is not turned on
2007-07-30 18:04:23 · answer #2 · answered by John Paul 7 · 0⤊ 0⤋
Not sure if it is supposed to come on with AC but it is supposed to come on when your engine temp goes up past a certain point a 100 deg C is BOILING !!
I would check to see if you have 12 volts at the fan when you think it's supposed to be on and if it's there, you need a new fan. If it's not, you may have a bad sensor which is supposed to turn it on.
Your AC working or not should not be a factor in the fan coming on or not.
GOOD luck.
2007-07-30 18:03:35 · answer #3 · answered by Dan Bueno 4 · 0⤊ 0⤋