190E (W201) 1982-1993: 190E 2.3, 190E 2.6, 190E 2.3-16, 190E 2.5-16, 190 D 2.2, 190 D 2.5, 190 D 2.5 TURBO, 190E 2.5-16 Evolution I, 190E 2.5-16 Evolution II

HELP! Radiator backing up-sounds like boiling

Old 09-07-2009, 12:08 AM
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2023 EQs 450+ & 2002 S430
Angry HELP! Radiator backing up-sounds like boiling

Today, my 190e 2.6 started making a boiling noise when I parked. I opened the hood, and that plastic container that holds the anti-freeze was boiling over (backing up and over flowing). Hopefully, this means I only need a thermostat...Anyone know what might cause this? Your help is appreciated.

Last edited by Revice; 09-07-2009 at 12:59 AM.
Old 09-07-2009, 08:14 AM
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T-stat or water pump...try t-stat 1st.
Old 09-10-2009, 09:00 PM
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was it actually boiling over and coming out of the overfill hose? or just getting air blow back?
Old 09-14-2009, 06:03 PM
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It never really came out of the overfill hose (although I did see some water on the ground under the car)..not a lot though. Thoughts?

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