About a year ago to the day my water pump started to fail. Over winter I went into the VoD and replaced it along with some smaller jobs. Since March I've been struggling to get the cooling system to operate correctly when previously it was solid other than a slight leak at the radiator. I'm just about at the end of my tether with it, so thought I'd check in for some collective wisdom on what to do next.
Things changed;
- New Water Pump
- New Thermostat (tested before fitting)
- New Otterstat (tested before fitting)
- New Temperature Gauge sender
- New Radiator
- New Fans
- New coolant tank pressure cap
- New silicone hoses for VoD and Waterpump
- New heater valve and silicone hoses
- New belts for A/C, and Alternator
- Bled at radiator until no air seen
- Bled at thermostat with rear end raised until no air seen
- System holds 15 psi for 30 minutes using a coolant pressure tester
- No leaks observed from the system, including using an inspection camera into the VoD
When testing the vehicle;
- Start engine with heater on and cabin fans running
- Remove coolant cap to observe good coolant flow that varies appropriately with revving the engine
- As engine warms up, tested vents in cabin to confirm good heat coming from heater core
- As engine warms up, observe drivers side of radiator warms up, with passenger side following over time
- As temperature gauge creeps upwards, fans to not engage at any point
- Jumping the fans at the otterstat engages the fans as expected
- Gauge reaches just below 220 mark. Stop engine and leave to cool completely
- Laser thermometer reading shows 118f temperature at thermostat housing exterior
- No evidence of head gasket issues present (oil looks good, coolant looks good. No signs of exhaust fumes in coolant during testing)
So with all that in mind, I'm stuck with where to go next. I've bled the system 3 times, and on the third attempt saw no air bubbles during the bleeding process. New gauge sender could be bad, but that seems very unlikely.
== EDIT ==
Sorry for generic topic title. Clicked submit too early and can't change it...