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Engine running cold 200 1993

posted by  Lyam on  Mon Jan 4 08:04 CST 2010
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last visit: Mon Jan 21 13:17 CST 2013
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Hi

1993 240 wagon, NA.

The car is running quite cold. Granted, it is very cold here (WI, 5deg F +/-) but the temp indicator gauge never goes above 25% up, even after 30 minutes of driving or so. I'm pretty sure the gauge works (it is not stuck at the bottom at least), but I cannot tell what is going on.

Also, heater is blowing cooler than usual (i.e. not burning my leg when I crank it).

Coolant level looks fine, and coolant is pretty much same color as new.

I have tried squeezing the coolant tubes going from radiator to engine to overflow reservoir, the top tube is quite hot, the lower tube is quite cool. Is this normal? Squeezing either one causes the fluid to squirt in the overflow res from below.

Can an air bubble work into the cooling system and prevent normal flow? Is there a pump that moves the coolant, or is it just convective? Idiot engine light is illuminated, and engine is throwing codes 121 and 231, but I'm pretty sure that is unrelated (just another dying AMM).

No idea where to start on this one, so any suggestions would be welcome.

Happy new year!






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New Engine running cold [200][1993]
posted by  Lyam subscriber  on Mon Jan 4 08:04 CST 2010 >


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