Got an 08 Lexus is250 that continues to overheat.
Changed thermostat & that took care of the check engine light that popped up.. but when I drive for about 45min to an hour it'll overheat again. Did a block test & there's no combustion gases in the coolant system so I know it's not a head gasket.. there's no leaking at all.. burped the system but it continues to bubble so i know there's air getting in somewhere.. today my ac light started flashing & the ac started to turn warm. I realized everytime it's overheated the ac was on.. can the ac leak into the coolant system? Would that cause the overheating?
What makes this problem better or worse?
Worse when ac is on & slower speeds
How long has your 2008 Lexus IS250 had this problem?
RepairPal Certified shops can diagnose and repair your 2008 Lexus IS250. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
Hello, I'm concerned that you still may have air pockets in the cooling system that need to be fully purged.
No, the coolant and air conditioning systems are entirely independent of each other.
Is your cooling fan turning on? With or without the air conditioning system being active?
