Visibility:defroster/defogger System:windshield:heater Core

[rustneversleeps]

1988 325iC E30

I'm in the process of doing timing belt one more hose to go the funky one with the 3 outlets that goes to the firewall assuming it goes to the heater core.Found out there was no thermostat in the housing "why".
Would it be because of this recall and that the thermostat is elsewhere......I found this information on Free Vehicle History.


Recall Subject: Visibility:defroster/defogger System:windshield:heater Core

Report Receipt Date: 02-01-1993

NHTSA Campaign: 93V015000

Manufacture: BAYERISCHE MOTOREN WERKE
Summary:

The Malfunction Or Failure Of A Coolant System Component Results In Significantly Increased Coolant Temperature And A Resulting Increase In System Pressure.
Consequence:

Vehicles Operated Under This Increased Cooling Systempressure Condition Can Suffer Damage Or Failure Of Parts Of The Cooling Systemsuch As (1) Leakage From A Coolant Hose, (2) Leakage Of The Radiator Orexpansion Tank, (3) Disconnection Of A Hose From A Pipe Or A Fitting, And (4)cracks In The Heater Core End Piece Resulting In Coolant Leakage. In Some Cases,boiling Coolant Can Contact The Lower Right Leg Of The Driver Resulting Inburns. Also, Escaping Coolant In The Passenger Compartment Can Cause Vaporfogging Of The Interior Surface Of The Windows, Reducing Driver Visibility.
Remedy:

This is the part where i like to know where it is .Where would this be thermostatic Bypass valve.HAs any body else had this recall back in 1993.
Pics would be nice...


Dealers Will Install A Thermostatic Bypass Valve In The Engine Compartment To Control Coolant Temperature In The Heater Core. Also, A New Design Radiator Cap Will Be Installed, To Control Pressure And Provide Greater Coolant Overflow In The Event Of Overheating.

Here what I'm talking about...Should i worry about it..

[vpilarrt]

No, that recall has to do with the hoses near the firewall that lead to the heater core. Some people remove the thermostat in the misguided attempt to solve an overheating issue. It's possible a PO did that.

[rustneversleeps]

I did change the the bottom one from the bottom heater core outlet that lead to the engine block" tight Squeeze"and the other one that just arrived today has the 3 inlets that leads to the top heater core outlet or is that an inlet..Also 80* thermostat going in regardless and new resistor for the Aux Fan.

I like to know where that Thermostatic Bypass Valve is in the engine compartment.

Maybe that recall doesn't even pertain to my 88 325iC....who knows..

[TobyB]

Some people remove the MAIN thermostat. Which you don't seem to have in that housing.

The reason that fails in a BMW is that, when cold, the t- stat runs coolant in a loop inside
the engine. As it warms, the t- stat starts to mix in cold water from the radiator.
At 'full hot' which one seldom reaches while driving, it routes full flow through the
rad.

If the main t- stat's removed, everything's mixed all the time- the engine has no way
to close the bypass loop, so it's a constant hot water leak. More like a hot water dump,
really.

That little doohickus under the back of the intake manifold is a bodge to try to stave
off the lawyers who smelt blood when a heater core or 2 exploded early on...
It probably DOES save the heater core, but gawd, it's a hack. And all it can do
is keep the heater core cooler...

t

[rustneversleeps]

That little doohickus under the back of the intake manifold is a bodge to try to stave
off the lawyers who smelt blood when a heater core or 2 exploded early on...
It probably DOES save the heater core, but gawd, it's a hack. And all it can do
is keep the heater core cooler...

Not sure what you mean here...

[TobyB]

What I mean is, it was hacked in to keep water above 71c (or whatever the temp cast into it)
out of the heater core. It was never designed to be there, it was added later.
There isn't room for it, it's just a pain in the ass.

Because BMW was (perhaps rightfully) afraid of US lawyers suing the shit out of them
for exploding heater cores.
This was well before McD's got sued over hot coffee- but in the same era.


t