Originally Posted by
Peter Aawen
When you say 'small bubbles', how big are you actually talking?? Tiny little things only a couple mm in dia, or something a bit bigger, maybe 8mm plus in dia? Bubble size is quite important in this instance, cos those tiny bubbles could be indicating a leaky gasket/cracked head, while the bigger bubbles just mean you probably added coolant without the engine running & you've got a fairly large pocket of air trapped somewhere in the cooling system that MUST be purged before it causes a leaky gasket/cracked head!! :lecturef_smilie:
If it's the big bubbles that you've got, then try raising the front of the Spyder (maybe put it up on ramps even?! ;) ) and run it for a few 'fan cycles' with the cap off, but do make sure the coolant level doesn't drop enough to empty that reservoir ! If it's getting reasonably cool where you are, you might find it helpful to cover the radiators with a coupla pieces of cardboard, just to block off any cooling airflow & hasten the whole process, cos you need those fan cycles to make sure the thermostat has opened & the cooling system reaches full flow, otherwise you can end up with a big bubble of air trapped behind the thermostat & that can cause all sorts of over-heating issues down track.... expensive over-heating issues!! :shocked:
However, if it's those really tiny bubbles that you've (already) got, and they aren't just a 'random few' but rather a fairly steady stream that could possibly look sorta like a 'light foam', then I'm sorry, but you've already got those 'expensive over-heating problems' and the only reason it's not really over-heating now is that at this stage the leaky gasket/cracked head is small enough that it isn't a major issue at idle speed - that won't last long like that at road speed/working the motor tho!!
Re the 'purging of air' bit, if the ambient temps are fairly cool, it can easily take TWICE as long as 45 mins to purge ALL of those air pockets outta the system, hence the cardboard in front of the radiator thing. ;)
Still, as Possible has already mentioned, can an you tell us a bit more about your initial 'over-heating situation'? What were you doing, & what exactly happened to make you aware of the situation?? :dontknow: Understanding that can help us properly diagnose the bubbles & their meaning now.... but there is (in some circles anyway... :rolleyes: ) a well known saying - Big Bubbles, No Troubles.... so if you don't have big bubbles, but rather you have small/tiny bubbles, it's likely that initial over-heating situation did do something nasty, & small bubbles means it's not really sounding great! :shocked: