1HDT Overheating (2 Viewers)

[Ghostrider I]

Ok...have a 91 80 series with the 1HDT Turbodiesel. Replaced radiator (aluminium) and water pump 5years ago. A week ago, it was blowing gray exhaust upon idle after a 45 min highway speed drive. Water temp was around 180, oil 200.

Today did same drive, lots more gray exhaust and water temp was 220 oil 220. Coolant overflow tank was bubbling, fired on heat but no heat coming out of vents. It has never in my ownership has overheated, in fact literally ran cool.

Thermostat?

 

[duncanrm]

Are you losing coolant? If so I'd be pressure testing the cooling system, and I suspect it'd be closely followed by the cylinder head coming off.

If you're not losing coolant, I'd be doing a pre-emptive full cooling system rebuild - water pump, thermostat, viscous fan hub, radiator flush, block flush, heater core flush.