I compiled the following list of cooling system temperatures to establish a baseline for monitoring temperature issues and I’ve posted it here in case it’s useful to anyone else. I’m assuming that my car is running at a “normal” temperature and I’m not accounting for ambient air temperature.
In my experience there is no change in readings when switching from OEM to the Mishimoto radiator but the only way to state that confidently would be to account for ambient temperature and engine load.
Thermostat housing temperature varied +/-10˚C over my tests and should not be considered accurate.
65˚C – Thermostat Housing +/-10˚C
80˚C – Top Radiator Hose
73˚C – Water Pump to Thermostat Housing Hose
75˚C – Bottom Radiator Hose
My criteria for the replacement radiator was improved cooling and OEM fitment. I set on the Mishimoto e30 / e36 radiator after recommendations from friends and finding only positive reviews in online BMW forums. Mishimoto offers a lifetime warranty which is comforting.
However, my decision shouldn’t be taken as endorsement and I haven’t run this radiator long enough to provide a real product review. After I installed this my close friend and local e30 expert Eric Berger told me that he knows several people who have had these radiators fail. In some cases the failure resulted in motor damage: it’s “buyer beware” as always. For the record Eric recommends Behr.
Because of Eric’s emphatic warning I’m going to monitor this radiator very closely especially as it approaches the first year of service. I did some further internet searches and found few reports of failures with the Mishimoto products. Mostly I found complaints about fitment. The few cases I found of failure were related to running straight water (no coolant) for long periods of time and in some cases not even using distilled water. Since coolant lubricates the moving parts of the cooling system and iron in water reacts with aluminum I blame careless owners for those failures I read about. I’m not sure what the issues were with the other local guys who had failures.
I found the quality of the Mishimoto radiator to be good and I would rate it a 9/10. It loses points for two reasons. Firstly, some of the fins were bent and a couple near the top were sheared off out of the box. Radiators are delicate but I’d expect it to be perfect on arrival. There’s a tool that can fix bent fins so I guess I’ll buy one.
Secondly I found fitment to be imperfect. One of the support posts was angled slightly outward. From post edge to post edge the radiator should be 26″ across but because of this defect my Mishimoto radiator was 26.15″ across. The solution was to cut down one of the rubber radiator mounts so that it would still seat to the radiator support. I don’t like this solution as it looks sloppy and failure due to a weakened mount is a concern.
Not necessarily a show stopper but there’s no fan shroud for a mechanical m20 fan that fits on the Mishimoto. I mean, you can throw one on but there’s no where to zip tie or clip it onto the rad. I’m still researching that.
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