On 4/10/2011 9:21 PM, Ross Kuhns wrote:
Bruce,
3 things - coolant leak, bad rad cap, or bad thermostat. I've seen many miatas
come with overheating problems and all sorts of theories.
It's best to start with the obvious before going to the exotic ideas.
Sometime one looses sight of the obvious. Thanks for trying
to pull me away from the precipice. :)
No thermostat right now - still over heats
Replaced rad cap - still overheats
Could be coolant leak - but it isn't obvious. I was
wondering how long the original radiator was going to last.
Could be an airlock?
Seeing more original radiators start with small cracks in the middle or leaks
around the end tanks; not enough to leave a trail on the ground.
It turns out there is a small coolant leak and coolant gets low, overheating,
cap blows, vicious cycle...I'm always surprised how many people don't know to
fill the radiator itself, they fill the overflow tank.
I've always filled the radiator itself. I have to admit, I
have forgotten about the overflow tank on occasion. :-[
Rad cap can do a similar, gets weak and blows off coolant, eventually low
coolant...then overheating...
When it's cool enough to take the cap off, you can see the water flow in the
radiator, pump is working.
What do you see in the radiator neck? Flow from radiator
inlet towards the center?
How do you do that? Whenever I've looked ( past two months
anyways ) there is no obvious flow in the radiator.
However, the observation time is not too long, because the
water expands pretty quickly and pushes itself out the
neck. I try not to wait that long, but it is pretty quick.
I've had a mess or two...
Thanks for the help.
Ross
On Apr 10, 2011, at 8:43 PM, Bruce Labitt wrote:
Both!
Timing belt was done at 60K. I didn't do it myself. I'll try to search my
records if the water pump was done too. (I hope it was...)
When I put the car away in the fall I noticed some gurgling at shutdown. No
overheating then. I did replace the radiator cap then, hoping that would
address the issue.
Arghh, sounding more like a water pump. FWIW, car was immediately shutdown
after the first geyser! Still idles well...
-Bruce
On 4/10/2011 8:32 PM, bill zimmerman wrote:
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