Well, this isn't encouraging.
turbodan wrote: Mar 28, 2023 10:45 PM
I fear the day that I need an e28 heater core. Like death, this situation will come for us all and no one knows how or when.
This might be an absurd statement because I'm 32, but I was always hoping that this BMW wouldn't die before I do. After a decade and a half of every single car on the market being unacceptably numb, digitized, and uninvolving to drive, I've lost hope that I will ever like any new cars again. Ironically the only new cars I sort of enjoy driving are electric, but I can't stand how festooned with touchscreens the interiors are. I am as big a fan of Star Trek TNG as anyone is, but I'm driving a car, not piloting a starship.
I did check with all the websites which show availability and they all report that they have none and have no idea when they will be available. How long has this been an issue for E28's? Have heater cores been unavailable for a decade? Or did I just happen to luck into needing one when they were all gone?
As much as it would be a bummer to not use the car in the winter, I am from California so I could probably live with it... IF the AC could blow at the windshield - but it can't. I'm not comfortable with the idea of having no windshield defogger, as I need to use them almost every day on the ocean side of the mountain range.
turbodan wrote: Mar 28, 2023 10:45 PM
Option number one which may be the most viable would be an electric heater core. These are available aftermarket or from various hybrid and electric vehicles.
This is an interesting proposition, but one I'm not entirely comfortable with. First of all, I see no way to control an electric heater from the OEM panel, and I'm not about to just put a toggle switch in the dash. I only got my heater valve working properly less than a year ago. Secondly, this is making a major change to the load on the electrical system. These aren't exactly 60's Ford Falcons, I wouldn't presume to understand the wiring well enough to know I wasn't setting myself up for electrical failures or damage to any of the computerized components. At the very least I'd want an uprated alternator to go with it.
turbodan wrote: Mar 28, 2023 10:45 PMIf you have the core out, take some measurements of the rectangular dimensions and we can start exploring options.
I really appreciate this, at the moment I do not have the core out. I tried to take the box apart yesterday, but got cold feet. I'm not entirely clear on how it comes apart, there is a screw that is stripped in place (i can't get it out), and i'm afraid of breaking the plastic. My mechanic who drained the AC system for me has been discussing options with me and is willing to help me get the box apart and see if we can make the Sofica unit fit, so I'm not going to mess with it until I bring it to him. If we can't make a sofica unit work, I won't have him reassemble the box, and I will be able to report on the dimensions.
turbodan wrote: Mar 28, 2023 10:45 PM
Option number two is to fit a different radiator in place of the stock core. What crossed my mind was a motorcycle radiator. If it can fit in the box, it can probably be made to work with some changes to the lines and connections. Heat output will likely be reduced as these aren't as densely finned as the original heater core. As long as it takes the chill off and defrosts the glass though, it's good enough for me.
I agree that I won't be broken up if the heat output is reduced. So long as it can deliver at least 50% of the heat the original heater did, I'm sure I'll be fine...
which leads me back to Sofica. Unless the Sofica unit is too big - which all research seems to suggest it is not, I imagine it's much easier to adapt it to fit my heater box than it would be to adapt a motorcycle radiator.