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Old 12-27-2002, 05:52 PM
Registered User
Join Date: May 2002
Posts: 12
Unhappy coolant leak

Hello all, I have a 1989 190e 2.6, and I have a coolant leak under the car when the heater has been on. I suspect a leaking heater core. Will the leaking coolant drain through the evaporator drain hose on to the ground? No leaks inside the car.

Thanks in advance, John
1989 190 E 2.6 148K miles
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Old 12-27-2002, 07:15 PM
engatwork's Avatar
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 11,232
Yes, if you have a leaking heater core it should drain through the same hole as the a/c system drain.
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Old 12-27-2002, 07:19 PM
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Join Date: May 2002
Posts: 12
Thanks for the reply, I'll start removing the dash next week.
1989 190 E 2.6 148K miles
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Old 12-28-2002, 03:37 AM
haasman's Avatar
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Join Date: Jun 2001
Location: San Francisco, CA
Posts: 3,096
J - I have been postponing doing the '87 190 heater core. Keep us posted on how it goes.

'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)
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Old 12-30-2002, 05:23 PM
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Join Date: May 2002
Posts: 12
What I'll try to do is when I start the heater core replacement, I'll post some pictures of the procedure.
1989 190 E 2.6 148K miles
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Old 03-12-2003, 01:39 PM
Registered User
Join Date: Aug 2001
Location: California
Posts: 177
Wink Replace Heater matrix / 190E 2.6

Had a coolant leak that was creating a puddle (the size of a saucer) underneath the transmission.

After replacing the heater feed and return hoses and checking the heater control valve, I realized that the likely culprit was the heater matrix (groan!). Interestingly, there was no internal leak or odor in the car - even when blowing hot air!

Using the workshop manual, I proceeded with all the tasks that are required to remove the dashboard.

Not a particularly difficult job - but you DO need the shop manual to avoid additional frustration. I also recommend labelling ALL fastners (with masking tape and pen) and placing in containers grouped by sub-assembly to avoid confusion with re-assembly.
Label the climate control vacuum hoses too!

My heater matrix was leaking at the end-joint.
Whilst doing this job I also replaced: -

- the radiator (diagnosed as partially blocked by a local shop)
- serpentine belt (might as well, whilst radiator out)
- badly corroded transmission cooler pipe - attached to lower radiator

... a bit ambitous maybe, but hopefully worthwhile.
The radiator had been causing 'hot running' in traffic and was the likely cause of some recent hose blow-outs.

End result, no more leaks, cooler running and the heater works a treat!


1991 190E 2.6 170k
1995 E320CA 57k
1999 Chevy Tahoe 98k
2000 R1150GS 45k
1983 300CD 178k - sold, but not forgotten
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