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View Full Version : Thermostat questions...


FJBen
12-28-2005, 02:58 PM
well, a few months ago I got a new OEM waterpump...and like a dumass I didn't change the thermostat...it seams to be leaking right there now. I'm assuming I'm going to have to drain the coolant out to change this???

And I should prolly replace the thermo and said gaskets even tho I have heat...it's more of a weeping very slow leak.

Ya know...you'd a thunk that after fixing all the leaking oil seals on the cruiser that I'd have an oil leak long before some sort of coolant leak...actually 2 coolant leaks now. :confused:

She went about 5 months without a single leak...now...they have been coolant...sheesh...

Rzeppa
12-28-2005, 03:21 PM
You don't have to drain ALL the coolant, just enough to get the level below where you're going to be working. If your radiator petcock works (often they're rusted closed), you're in luck, just drain into an empty antifreeze jug, probably a gallon should do it. You didn't mention whether it was where the top half of the housing attaches to the bottom half, or where the bottom half attaches to the head? In any case, don't forget the round rubber gasket that goes on top of the thermostat! This gasket (o-ring in Toyota parts jargon) prevents coolant from bypassing the thermostat when it's supposed to be closed.

These are easy gaskets to replace, but hard to scrape the old gasket and gunga off the old surfaces. Also, do NOT overtighten the two bolts that hold the top half of the housing onto the bottom half, it's easy to strip the alloy (don't ask me how I know this :-)

Maddmatt
12-29-2005, 09:33 AM
These are easy gaskets to replace, but hard to scrape the old gasket and gunga off the old surfaces. Also, do NOT overtighten the two bolts that hold the top half of the housing onto the bottom half, it's easy to strip the alloy (don't ask me how I know this :-)

Word. Also lube up those bolts with your favorite pre-wrenching additive, WD40, etc... pretty well first. It's easy to break those bad boys off in the housing too. don't ask me how I know that.
-Matt

nakman
12-29-2005, 10:13 AM
don't ask me how I know that.
Yeah, but how did you FIX it after it happened? :D

Rzeppa
12-29-2005, 11:25 AM
Here's a photo of the top gasket:

FJBen
12-29-2005, 03:02 PM
Very cool, thanks for the help guys. Better order me up some parts. This will be the 3rd time I've had to mess with coolant since the summer. :(

Once when I put the engine in..

Then the waterpump...

now this...woot woot! I'll prolly just do it next year ;)

Rzeppa
12-29-2005, 03:13 PM
I'll prolly just do it next year ;)Heh. As of right now, I've put most of my projects on hold until next year :-)