730, M30 E32 1992 heater - water leak
Looking for advice.
I have a water leak into the car from the heater. It can have only started a
couple of months ago when I topped up the coolant. A thing i do not
normally have to do.
I now have noticed damp under both from mats, worse on the passenger side
and the vent to the rear seats when opened water can be heard and I have
drawn some off today with a tube and it is coolant. I am not really a DIY
car mechanic [but do have a haynes manual] the car is 1992 and does not
warrant going into a garage which is 80 miles away.
I feel that the heater radiator has sprung a small leak and over time has
collected in the area. I am wondering if a radiator leak sealer would stop
it - would there be any harm in trying. I only do about 1000 miles per year
and only local. Would this be easy to check by taking out the glove box?
Any advice would be appreciated. Even if this is a short fix - that would be
ok - i could clean the carpets etc. Over 2 months the water level has
dropped by about 1.5" down the filler but not brought up an alarm.
Any advice would be appreciated.
Replacing the heater core in 5-series of this vintage is a difficult and
lengthy task. I suspect that it's similar in a 7-series. Additionally, if
you have the two-temperature-zone system, there are two radiators
The sealer is not recommended. It might work, it might gum up the heater
control valve (or other valves), it might not work. And it might ruin the
corrosion-protection values of the coolant.
I think the car has reached almost the end of it's life for me. It has to go
and if this will quick fix - I think i would be happy.
I will have to think - this leakage into the car has to stop.
Thanks for your reply.
This is precisely what has happened... and taking out the glove box is
probably not enough. I have not done an E32, but the 5-series cars of
that era are a horrible nightmare to get the dashboard apart on.
You can TRY the Bar's Leaks brand sealer.... what you want is the kind
with the grey plastic pebbles, not the other sort. There is a chance
that it will temporarily fix the problem.
There is also a chance that it will clog up your water pump too. For
the most part, the modern plastic sealers are a lot less apt to do
damage than the older kapok, but they still are not completely harmless.
Find a local mechanic that you trust, who has a lot of time. This is not
a job that requires sophisticated techniques and troubleshooting skills,
but it's a job that requires a whole lot of work to get the thing apart
and back together. You want a blacksmith grade mechanic, not an expert
diagnostician. The glop in the system might fix it, but if you intend on
driving this thing forever (and you should be able to do that), you really
want to repair it right. Even though it's a hell of a lot of time involved.
"C'est un Nagra. C'est suisse, et tres, tres precis."
No I have decided to get rid of this car as my step son, who used to repair
the BMW's [3 2*530 and one 730] has moved on.
The stuff I have purchased is called carlube. it says it repairs leaking
radiators fast and stays active to seal future leaks. It will not harm
hoses or gaskets. It's made by Tetrosyl ltd. Bury, Lancs.UK
This car has given me 6 years of trouble free motoring, except for brake
pipes and an exhaust. It's done 130,000 miles but is getting clobbered with
high petrol costs and road car tax.
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