Coolant flush Question

MA Tomar · 09-22-2009, 09:31 PM

Hi All,
After flushing out the coolant system of my 1985 MR2, I noticed that no fluid came out of the water inlet air bleeder valve. The other air bleeder valves bled the coolant, but the aforementioned valve was dry. I probes the valve with a pen and rusty fluid showed up on the pen tip. Any suggestions about this issue? The rest of the cooling system is working great, but in full disclosure, the previous owner used water as a coolant (it took gallons of water to clean out all of the residues in the coolant system).
Thank you for your help.
Alex

dirocyn · 09-23-2009, 07:54 AM

Fluid should circulate through there, if fluid doesn't come out you can't tell whether the air is coming out. That valve sits right on top of the water inlet, it's the part you take off to reach the thermostat. I suggest you take the water inlet off, detach it from the water inlet hose, back the plastic bleed screw all the way out, and soak the sucker in CLR or some other rust-removing product. I'd clean out the thermostat housing as well, it's probably pretty cruddy. Just take care not to scratch the mating surfaces, you don't want it to leak when you put it back together.

The thermostat itself is probably also crudded up, but I would not clean it with any product other than water, don't know what would happen to it. BGB describes testing the thermostat, just pitch the thermostat into a pan of water along with a thermometer, heat the water on the stove and note what temp the thermometer says when the thermostat opens. It's supposed to open between 176 and 183, and open by 8mm by 203 degrees. If you decide to replace the thermostat, most guys on here recommend the genuine Toyota part.

esreveRBackwards · 09-23-2009, 11:38 AM

My water inlet air bleeder valve had crud in it. I had to take the whole housing off just to take the valve off. Once I did that, I took the valve off the housing, took the plastic top off and blew the whole thing out with compressed air. Alot of gunk came out of the water inlet air bleeder valve

09-22-2009, 09:31 PM	#1 (permalink)
MA Tomar MA Tomar Join Date: Sep 2009 Location: Houston, TX Posts: 4 Thanks: 3 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	Coolant flush Question Hi All, After flushing out the coolant system of my 1985 MR2, I noticed that no fluid came out of the water inlet air bleeder valve. The other air bleeder valves bled the coolant, but the aforementioned valve was dry. I probes the valve with a pen and rusty fluid showed up on the pen tip. Any suggestions about this issue? The rest of the cooling system is working great, but in full disclosure, the previous owner used water as a coolant (it took gallons of water to clean out all of the residues in the coolant system). Thank you for your help. Alex

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09-23-2009, 07:54 AM	#2 (permalink)
dirocyn Cage Fighter Join Date: Mar 2009 Location: Murfreesboro, TN Posts: 208 Thanks: 7 Thanked 19 Times in 19 Posts iTrader Rating: (0/0% )	Fluid should circulate through there, if fluid doesn't come out you can't tell whether the air is coming out. That valve sits right on top of the water inlet, it's the part you take off to reach the thermostat. I suggest you take the water inlet off, detach it from the water inlet hose, back the plastic bleed screw all the way out, and soak the sucker in CLR or some other rust-removing product. I'd clean out the thermostat housing as well, it's probably pretty cruddy. Just take care not to scratch the mating surfaces, you don't want it to leak when you put it back together. The thermostat itself is probably also crudded up, but I would not clean it with any product other than water, don't know what would happen to it. BGB describes testing the thermostat, just pitch the thermostat into a pan of water along with a thermometer, heat the water on the stove and note what temp the thermometer says when the thermostat opens. It's supposed to open between 176 and 183, and open by 8mm by 203 degrees. If you decide to replace the thermostat, most guys on here recommend the genuine Toyota part.

09-23-2009, 11:38 AM	#3 (permalink)
esreveRBackwards Some Skills Join Date: Jul 2008 Posts: 78 Thanks: 15 Thanked 1 Time in 1 Post iTrader Rating: (0/0% )	My water inlet air bleeder valve had crud in it. I had to take the whole housing off just to take the valve off. Once I did that, I took the valve off the housing, took the plastic top off and blew the whole thing out with compressed air. Alot of gunk came out of the water inlet air bleeder valve