(98 328i E36) So I decide to change the thermostat on my car. I ended up
having to pull the whole radiator out and the fan off in order to reach the
bottom bolts on the housing. When I was putting it back on I snapped the head
off of on of the bolts. I decide to see if it would work with out it. It did
not and started to drip a day later. So I took it back apart and replaced the
bolt. It looked fine, but I noticed a small drip this afternoon. Dose anyone
know how to fix this? I really dont want to have to pull it all back apart
again. Do you think it will seal up on its own? What should I do?
Message posted via CarKB.com
I changed my stat last weekend in about 20mins.
Remove fan and fan shroud, 4 bolts (3xM6, 1xM8), replace stat using new
o-ring and rubber gasket, and it's all done. (Refilling and bleeding the
cooling system afterwards naturally0.
As for snapping off a bolt, do you own a torque wrench? If not, I think
you'd be better off taking it to a decent mech. Seriously.
Well, it probably has as much chance of fixing itself as I do of winning the
lottery. On my 97 328, I had no problem replacing the T-housing by just removing
the fan - not sure why yours would be so different.
As far as fixing it - have you torqued all the bolts evenly? If not, that MAY
fix it. Not sure, but possibly running without the final bolt for awhile, there,
could have damaged the gasket, because of the uneven pressure or it got pinched -
again, don't know for sure. Only way to find out is to torque all bolts properly
now and cross your fingers. If it doesn't work, you will need to replace the
Last question - do you have the plastic T-housing? Could it have cracked from
the uneven torque when the bolt was missing? If you need to go in again, then
you should replace with a metal T-housing - see BavAuto or Pelican Parts etc.
Best of Luck
... I think I should have. One thing I did notice was that when I put the new
t state in the black rubber seal made it hard to seat the T-stat, so made it
did not seat right. Is there any web site or pictures of the bolts to take
the fan off with out takeing the radiator off?
old one and fit the new one (noting the correct orientation arrow if there
is one). Then place new O-ring to 'hold' the new stat in place (a little
silicone grease really helps here). fit new rubber gasket in housing and
refit, torquing bolts appropriately.
Refit hoses, fan and fan shroud. Refill and bleed system (With claimte
control/heating on HOT with ignition on but engine NOT running initially).
Screw up bleed screw when no more bubbles are present, fire up engine and
warm up until new stat opens. Switch off, allow to cool, and top up coolant
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