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post #1 of 32 (permalink) Old 07-12-2019, 07:17 AM Thread Starter
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Radiator

Does anyone have a "thermal image" of the radiator of a 230E sedan -90? E.g. either a proper thermal image or just some temp readings from different spots on the radiator, and how cool should the water be exiting the radiator?
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post #2 of 32 (permalink) Old 07-13-2019, 10:25 PM
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I have a 320 (m104 3.2L), and I have an IR thermometer. I could probably take a grid of readings, maybe 50mm apart ?

of course, the results will be highly dependent on the ambient temperature, and engine conditions, I can only do it with the engine idling with the hood up, after a test drive. my radiator is at least a few years old, I've not replaced it since I got the car 4 years ago, but I'm vaguely remembering seeing recipients for a radiator in the PO's repair records. my car has 260000 miles (420000 km), the rad was probably replaced around 200k mi (320k km)


edit: oops, radiator was replaced at 137k miles, 220k km, that was in 2009
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Last edited by LeftCoastGeek; 07-13-2019 at 10:31 PM.
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post #3 of 32 (permalink) Old 07-14-2019, 06:41 AM
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Originally Posted by Björn Lundquist View Post
Does anyone have a "thermal image" of the radiator of a 230E sedan -90? E.g. either a proper thermal image or just some temp readings from different spots on the radiator, and how cool should the water be exiting the radiator?
What problem are you trying to determine a solution for?

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post #4 of 32 (permalink) Old 07-14-2019, 08:40 AM Thread Starter
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That would be awesome... I think I only need a reading from the top driver side (where the coolant enters), one in the opposite upper corner, one in the middle and then one where the coolant exits in the lower corner. That would be absolutely great. And also what the temperature gauge shows in the dash... so I can compare.
Thanks alot!
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post #5 of 32 (permalink) Old 07-14-2019, 08:43 AM Thread Starter
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What problem are you trying to determine a solution for?

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I have a hunch that my radiator is seriously under performing.... The engine gets hot but when I turn on the heater then it goes down (got the aux pump). I got a new thermostat, a new filler cap, water pump replaced 3000 km ago and I neither loose coolant nor get oil into the coolant.
I noticed that the coolant exiting the radiator is VERY cool even when the coolant temp is at 110...
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post #6 of 32 (permalink) Old 07-14-2019, 08:45 AM
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Originally Posted by Björn Lundquist View Post
That would be awesome... I think I only need a reading from the top driver side (where the coolant enters), one in the opposite upper corner, one in the middle and then one where the coolant exits in the lower corner. That would be absolutely great. And also what the temperature gauge shows in the dash... so I can compare.

Thanks alot!
Once again

What problem are you hoping to solve with all the readings?

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post #7 of 32 (permalink) Old 07-14-2019, 08:47 AM Thread Starter
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Once again

What problem are you hoping to solve with all the readings?

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Compare those with what I get from my radiator... I rather do that before I shell out almost 500 usd on a new radiator.
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post #8 of 32 (permalink) Old 07-14-2019, 08:48 AM
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How many miles are on the radiator? Have you done a citric acid flush?

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post #9 of 32 (permalink) Old 07-14-2019, 08:52 AM Thread Starter
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How many miles are on the radiator? Have you done a citric acid flush?

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220000 km but it has been standing still for a year or two almost around 120000 km and nowadays it is only driver one or two months per year so shit have happened probably which wouldnt have occured if beeing driven regularly over its life.

Havent done the citric acid flush, want to get some data from the radiator first before I start flushing the system.

Next step will be disconnecting the rad and do a flow test and see what that say in conjunction with the thermal readings.
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post #10 of 32 (permalink) Old 07-14-2019, 09:02 AM
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I'd pull the radiator and have it professionally flushed. Are you using MB coolant and distilled water?

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