mobius Posted February 20, 2014 Share Posted February 20, 2014 (edited) Meant 0.6 PSi Changed my rad about 6 months ago and noticed getting an air lock in system with some coolant loss can't find any leaks anywhere but noticed that expansion tank sitting about 30mm higher than max mark and noticed that there are signs of coolant on plastic tray below expansion overflow pipe, Car does not get heavy use so taken me a while to figure it out deliberatly going longer runs to get temp up. No signs of overheating, but this must be where coolant loss is from. I noticed that the rad cap that came with replacement rad is rates at 0.6 psi and and if I remeber correctly OEM is 1.1would a cap that was too low rating cause this problem thanks Edited February 20, 2014 by mobius (see edit history) Quote Link to comment Share on other sites More sharing options...
Digsy Posted February 20, 2014 Share Posted February 20, 2014 It's not ideal, but the coolant should actually not boil until it reaches nearly 120degrees if you are running a 50/50 mix, even with a 6psi cap. I'd replace it with an OEM one and see if the problem goes away. Quote Link to comment Share on other sites More sharing options...
mobius Posted February 20, 2014 Author Share Posted February 20, 2014 Thought a bit low order one tonight thanks50/50 mix Quote Link to comment Share on other sites More sharing options...
TubbyTwo Posted February 20, 2014 Share Posted February 20, 2014 Any good links online for an oem rad cap? Quote Link to comment Share on other sites More sharing options...
Digsy Posted February 20, 2014 Share Posted February 20, 2014 They cost peanuts. Just go to a Toyota dealer. Quote Link to comment Share on other sites More sharing options...
mobius Posted February 20, 2014 Author Share Posted February 20, 2014 Ordered a 1.1 bar from fensport Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted February 21, 2014 Share Posted February 21, 2014 (edited) It won't be 0.6 pounds per square inch, it will be Bar!!! (8.7 PSI) I would err away from higher than stock pressure rad caps, heater matrices are now tired and prone to leaking. Raising the potential coolant pressure is perhaps just asking for trouble. Edited February 21, 2014 by Chris Wilson (see edit history) Quote Link to comment Share on other sites More sharing options...
Digsy Posted February 21, 2014 Share Posted February 21, 2014 It won't be 0.6 pounds per square inch, it will be Bar!!! (8.7 PSI) I would err away from higher than stock pressure rad caps, heater matrices are now tired and prone to leaking. Raising the potential coolant pressure is perhaps just asking for trouble. Ah, I assumed the OP meant 0.6PSI (0.4 bar) above atmospheric, so 1.4 bar. Quote Link to comment Share on other sites More sharing options...
mobius Posted February 21, 2014 Author Share Posted February 21, 2014 Yip 0.6 on cap still investigating might head gasket if cap doesn't work look like a trip to The Garage in Wishaw. Quote Link to comment Share on other sites More sharing options...
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