Quote:
Originally Posted by Chimble
The expansion tank has started to discharge coolant when hot. The heater is blowing hot but the radiator is cold and the pipe from the thermostat to the rad (the one with the bleed screw) is cold. Radiator fan is also running high but not helping matters because there is no heat in the radiator.
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We've heard this story before David. These are the classic symptoms of a thermostat which isn't opening. It happens after
K-seal or
Steel Seal has been put into the cooling system and interferes with the thermostat's operation. It causes unpredictable and varying behaviour just as you describe.
You mention the possibility of a "blockage" in the radiator. I'm not sure where material would come from that is capable of blocking
every channel. When you drained the coolant, was it heavily contaminated? You've said that the heater is blowing hot so how is it that the radiator could be blocked but the heater matrix isn't?
Some members have found a lump of sealant in the flow through the oil cooler. That would produce your symptoms but I suggest that you start with the easiest test: a full drain, refill and bleed. You can back flush the radiator then to settle the question once and for all.
Simon