1993 Corsa overheating

[rt63]

I have a 1993 Turbo Diesel corsa, and it keeps overheating. There is hot air coming out of the internal heating system and if I put the fan onto hot i can lower the temperature of the engine. I have shorted out the thermoswitch on the bottom of the radiator and the electric fan comes on but the temperture stays the same, so I replaced the switch for a new one, the car still overheats. I have removed & checked the thermostat and this works fine. I have removed & checked the water pump thats fine All the water hoses top & bottom on the radiator are hot. So I have run out of ideas please help me someone

[david1702198]

i have seen a couple of head gaskets go in my time on the 1.7 diesel, is it a vauxhall or isuzu engine?

[TWR]

Hi, replace the Thermos + the sender. Have you replaced anything in the cooling system? if so, an air lock.

[jake-the-peg]

Blocked radiator core?

Perhaps only part of your radiator is working, you'd still get hot pipes.

[rt63]

Its a vauxhall Engine, I've had to put some Radweld into the radiator to stop a leaking heater matrix (internal matrix), but since then I have used a Radflush to clean out the system, maybe the radiator was on its way out, or would the radweld have closed any of the water channels in the engine block ?