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Old 04-19-2006, 05:24 PM
Posts: n/a
Steamed on the freeway. Heater Core?

Steaming radiator fluid has filled the interior of my 1992 300E 2.6
Nothing leaking under the hood. Steam is mostly coming from vents on dash.
I've just replaced the radiator and now I suspect a heater core.
Any advice or link to more info on this job.

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Old 04-19-2006, 05:52 PM
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Join Date: Aug 2005
Location: Palmdale/Ventura, CA
Posts: 813
My experience with american cars would tell me you are right.

Heater core.

Your earlier post described replacing the radiator and therefore closing
any escape routes for pressure.

Check the manual or maybe for the online manual.

Heater cores are not too bad. Just some time and lots of removing parts
to get at the thing.
80 300D 340K Owned 30 yrs
83 300SD 440K Owned 9 yrs - Daily Driver 150mi/day
02 Z71 Suburban 117,000
15 Toyota Prius 2600 miles
00 Harley Sportster 24k
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Old 04-19-2006, 06:55 PM
MikeTangas's Avatar
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Join Date: Apr 2000
Location: So. Cal
Posts: 4,430
Check the heater core hoses at the firewall, make sure one of those didn't rupture. If it is the hearter core, expect to gut the dash. Seems these cars are built around the evaporator and heater core.

Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

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