I've been in the middle of this myself. My '78B (your message quoted here
doesn't say which year you have) is often running hot. Never below 70%,
often up to the edge of the red.
Various solutions are (not in any particular order):
- New thermostat
- Flush radiator
- Flush the thermostat housing
- Flush the heater
- Replace or recore the radiator
- Sufficient coolant
- Make sure the thermoswitch on the radiator works (more important when
idling than when driving)
- Make sure the temperature sender is okay (a bad guage will lead you astray)
Not sure if I forgot any...
Personally, I'm about to recore the radiator. I've done about everything else.
- Tab
At 08:24 AM 7/28/00 -0500, Mark Purtell wrote:
>Thanks for the help already, but I'm still a bit puzzled by the MGB's
>cooling system. I flushed the system, and refilled the block and radiator
>with coolant. Then I drove the car (to open up the thermostat) and added
>more coolant (I did this twice). Now when I drive the car, the
>temperature needle moves up to the middle of the gauge temperature at a
>"normal" rate, and then once it reaches about halfway, it stays there for
>a minute or two and then it shoots up to the overheat area-it doesn't
>always reach "overheat", but it gets close and will occasionaly peg the
>end of the gauge. Once the needle says "overheat", as I drive faster, the
>temperature gauge moves down from overheat, but never remains in the
>middle of the gauge. The engine doesn't seem really hot, and my Hayden
>fan is running fine. I have already replaced the temp sensor and have 180
>degree thermostat in it.
>
>Thanks in advance-
>Mark
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