I have a '96, and my heater control valve (which was only 6 months old) started leaking, so we replaced it under warranty from Toyota with another brand new unit. Now, 2 weeks later, this one is leaking.
The shop and I have traced it to the control valve due to the location of the residual coolant on the hoses beneath.
Now, the question I have is this. It's been below freezing at night here, and when the first valve started leaking, it was low teens over the night, and hit 65 during the day. The same thing happened last night, and I noticed drops of coolant under the truck this afternoon. Truck was parked for multiple days prior on both occasions.
It doesn't matter if the valve is open, or closed. It's not a significant amount of fluid, but I'm confused how a second brand new unit would fail in the same manner. Is it a pressure thing moving from the low temps at night, to warm temps during the day? Is it the radiator cap not releasing pressure during this change? The rest of the cooling system works great, make up take does its job and my temps are rock solid.
The shop and I have traced it to the control valve due to the location of the residual coolant on the hoses beneath.
Now, the question I have is this. It's been below freezing at night here, and when the first valve started leaking, it was low teens over the night, and hit 65 during the day. The same thing happened last night, and I noticed drops of coolant under the truck this afternoon. Truck was parked for multiple days prior on both occasions.
It doesn't matter if the valve is open, or closed. It's not a significant amount of fluid, but I'm confused how a second brand new unit would fail in the same manner. Is it a pressure thing moving from the low temps at night, to warm temps during the day? Is it the radiator cap not releasing pressure during this change? The rest of the cooling system works great, make up take does its job and my temps are rock solid.
