I have seen the temperatures fluctuation when the coolant was low. Make
sure it is full.
Councill, David wrote:
> A slow week or two with the list so I will throw in today's MG problem.
>
>
>
> Its been almost a month since I've driven my MGS due to cold weather or
> snow, but today I finally decided to take the 67 BGT for a drive to
> owrk. Temps have gotten above freezing enough that most of the snow is
> melted and today was supposed to be nice, sunny, and mid30s according to
> most weather forcasts (except for my Internet Weather Watcher program -
> it said snow in the afternoon). It was a bit cold, 7 above when I
> started my 67BGT. It took a little cranking but it fired up and ran like
> a charm. By the time I got to work, I couldn't see my breath anymore but
> I still had the characteristic ice in the middle inside of the
> windshield.
>
>
>
> But just as I was pulling in the parking spot, I noticed my coolant temp
> was up to 220 and rising after running a teady 190 for several miles of
> city driving. But getting out of the car, I saw no signs of leaking nor
> any evidence that the coolant really was running hot (no sounds, no
> steam, no smell). About nine hours later, the snow is coming down hard
> as I started back to the car but al least it is in the high 20s outside.
> Car starts right up and I head for home. But within a mile, the coolant
> temp keeps climbing past 190, up to 210, and I figure a problem is at
> hand. And then, the temperature guage within maybe 2-3 seconds drops
> down to 170 (about where it should have been at that point in the
> drive). That was weird in itself but just as I was getting to my
> driveway, the temp starts climbing again, fairly rapidly, and hits 230
> as I turn the engine off. I opened the bonnet and again, no sign of
> overheating. But the radiator itself was cool to the touch. I suppsoe I
> should have checked it out further but it was dark and snowing and I am
> in no hurry. With the weather change, I'll likely drive the much warmer
> Land Rover tomorrow.
>
>
>
> I figured I can put in another thermostat. I am sure I have several
> unused ones around. Can a thermostat completely close after it has
> opened and temps are still warm? I have known for them to stick shut or
> not open when they are supposed to. I might suspect the much more
> expensive sender/gauge setup used in the early Bs but the cool radiator
> indicates more on the lines of a circulation problem. The radiator is a
> new one, about two years old. I suppose its theoretically possible the
> water pump impellor could be slipping. So I'm just checking the list to
> see if someone has had a problem similar to mine before I start tearing
> into things other than the thermostat since thats a 15 minute $5 job.
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