Overheating and need help
#32
Nordschleife Master
That was one of the big changes to improve the drag coefficient for the S4.
#34
Intermediate
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Join Date: Oct 2007
Location: '85 32v 5spd LSD - Vancouver, Canada
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Thanks to one and all for the help - I am convinced this was all caused from a crapped out relay - I think it was randomly turning the fan off and on which only manifested itself when I sat for a long time idling in traffic. I am guessing the trigger for the fail was probably, as was suggested, due to high heat from being in close proximity to the rad and not in any air flow. Re-jigged and placed a new in-line relay to be infront and to the side of the heat. All "seems" to be OK after a number of short trips to test it out. New relay - $12. Feeling like I am not about to overheat again and blow the engine - priceless! Any merit in breaking open the old relay to see if and how it failed? What would I look for?
#35
928 Collector
Rennlist Member
Rennlist Member
#36
Team Owner
open the relay and smell it .
Does it smell burned??
Are there any solder joints that look freshly soldered? ( indicated hi heat to reflow the solder). clean off the contacts in the relay see if it works
Does it smell burned??
Are there any solder joints that look freshly soldered? ( indicated hi heat to reflow the solder). clean off the contacts in the relay see if it works
#37
Rennlist Member
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The overheating that you had is almost always airflow related. I never saw an answer on the belly pan and air sealing around the radiator.
That being said, you also need to reconsider the high antifreeze percentage. There is a considerable difference in cooling capacity of ethylene glycol and water. Even in your area, I wouldn't go much past 60/40.
That being said, you also need to reconsider the high antifreeze percentage. There is a considerable difference in cooling capacity of ethylene glycol and water. Even in your area, I wouldn't go much past 60/40.
#38
Rennlist Member
I agree with Wally on the mix. Both cooling and freezing propeties improve with a mix rather than 100% of either.
Drop in some water wetter while you're at it.
Drop in some water wetter while you're at it.