Fans are no longer working? I noticed when I was sitting in the drive thru I would get hot air but when I drove home I would get cool air with AC on. I noticed a few days ago after I turned my car off I still heard fans running 10 seconds or so after I shut car down. Now it seems the two cooling fans are not coming on at all and it is causing temp to rise obviously. I am also losing some coolant however when I twist the globe (coolant tank) some coolant comes back up and I hear a hissing sound.
Thoughts on all this?
First thing you should do is find and fix your coolant leaks. A hissing sound is normal when you open the cap on a warm engine because a warm cooling system is pressurized to about 14 PSI which raises the coolant boiling point to about 265F.
Leaks will not allow the system to pressurize properly and can cause the coolant to boil at normal engine operating temps. After you fix the leaks you should reevaluate your issues.
*Added: Almost forgot, another very possible place for coolant leaks on older BRM engines is the hoses on the back of the engine for the EGR cooler. They are best inspected from the bottom side of the engine.
In a properly functioning system, cooling fans almost never come on for engine cooling unless you are stuck in traffic on a warm day. If you are driving at say 25 mph with the AC off the fans should not come on and the temp will be in the normal operating range.
If you come to a stop and the temp seems to rise quickly it might be because your system is leaking. On a 75F day when I come to stop with a warm engine with the AC off, the cooling fans don't come on for at least 10 minutes of idling.
