Morris Minor Owners Club

Hello!

I have an issue (I think) with my heater tap. Today I've changed my heater hoses as they were perished.

However, when I went to test them for leaks there was not a hint of heat (and therefore I assume, coolant) through them. I ran the car for long enough that the radiator top and bottom hoses were hot (I guess this is a good indication the thermostat was open?).

My 'push for heat' knob was 'in' and appeared to affect the heater tap (as in the cable had pushed the lever to the right).

Can the heater tap jam shut even thought the lever appears to be operating as one might expect?

Yes I think it can jam shut. There’s a rubber diaphragm inside. The reason I know this is my heater valve “exploded” a few days ago and I could clearly see the rubber diaphragm. Unfortunately I do not think the valve is serviceable so will need replacement

svenedin wrote: ↑Sun Feb 12, 2023 7:07 pm Yes I think it can jam shut. There’s a rubber diaphragm inside. The reason I know this is my heater valve “exploded” a few days ago and I could clearly see the rubber diaphragm. Unfortunately I do not think the valve is serviceable so will need replacement

Thanks for your reply

It was indeed my valve, it was completely gunged up.
So I’ve now replaced it with the older brass tap and my heater is now lovely and hot!