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Old 09-20-2015, 06:09 PM
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Here's a quiz for you DIY'ers

Ok, you expert DIY'ers, here's a lil' quiz for ya. Look at the picture; now what do you think caused this? The expansion tank is brand new.

Choose the correct answer below. Only one answer is correct:

A) The engine overheated expanding the coolant beyond what the cooling system could handle;

B) The expansion tank has a manufacturers defect;

C) The coolant was overfilled causing over-pressurization of the cooling system;

D) The coolant got extremely hot thus melting the expansion tank joints.
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Last edited by X5only; 09-22-2015 at 05:18 PM.
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Old 09-20-2015, 07:13 PM
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Since tank is brand new - the most probable answer is
B) The expansion tank has a manufacturers defect;
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Old 09-20-2015, 08:02 PM
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E) 2 Bar tank cap
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Old 09-20-2015, 08:12 PM
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A & D
Most people don't look at the gauges or care about the lights. They think they can drive 1 or 2 more miles and get home.
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Old 09-20-2015, 09:51 PM
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Why was the Overflow tank replaced? My guess is whatever the cause for the original tank going bad has occurred again with the new tank.

Symptom was treated, not the cause.

Just my guess...
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Old 09-20-2015, 10:09 PM
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C
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Old 09-20-2015, 11:02 PM
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I'm thinking a variation of answer C; perhaps the coolant and water aren't a 50/50 ratio with more water than coolant causing a higher pressurized (steam) system
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Old 09-21-2015, 12:03 AM
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Quote:
Originally Posted by Joshdub View Post
C
Bingo, we got a winner! The correct 50/50 coolant mixer was overfilled causing over-pressurization of the cooling system. Happened twice- first there was hairline crack on the side of the tank. Replaced and 2 weeks later the leak as shown in the picture. The dealer replaced them assuming it was manufacturing defect.

The coolant level must be correct. It is correct when the end of the red float is aligned with the upper edge of the filler opening, or max. 0.8in/2 cm higher, i. e. up to the mark on the float (refer to the schematic diagram, next to the reservoir cap).
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Old 09-21-2015, 12:09 AM
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Quote:
Originally Posted by Kristophe View Post
I'm thinking a variation of answer C; perhaps the coolant and water aren't a 50/50 ratio with more water than coolant causing a higher pressurized (steam) system
Yes, Kristophe, a winner too! Very important to have the correct mixture!
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Old 09-21-2015, 12:40 AM
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If it were a over pressure event then wouldnt pressure be vented out the expansion tank cap without any damage to the other components?
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