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Just changed Thermostat. Bleeding questions!

 
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impala2k
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2000 Chevrolet Impala


PostPosted: Thu Jun 03, 2010 2:48 am    Post subject:  Just changed Thermostat. Bleeding questions! Reply with quote

So I changed the thermostat and ran some heavy duty coolant line to bypass the TB. It was a PITA to change. If my friend wouldn't have showed up with his stubby wrenches I never would have gotten it done. But don't know if I bled the system right. I filled radiator, let car warm up, let the thermostat kick in a few times, then turned it off and popped the radiator cap and saw and heard the air rush out of the radiator into the resovoir and into the atmosphere. I repeated this a couple times, and then drove it for a few, and repeated the popping the cap deal. And the last time I popped it fluid came out instead of just air so I think i am good. I know this wasn't the best way to do the bleeding, but I have never done it before and it seemed to work. But bow I have coolant everywhere in my engine bay!!!lol time for a hose and some degreaser! But let me know if you think I should do something else to bleed it. thanks.

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labriola
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2005 Chevrolet Impala
2003 Chevrolet Cavalier


PostPosted: Thu Jun 03, 2010 7:52 am    Post subject:   Reply with quote

u can park uphill and let car run while bleeders on top front is open... till it comes out in a stream without air bubbles....

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NUTSgoWEEE
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2003 Chevrolet Impala


PostPosted: Thu Jun 03, 2010 8:29 am    Post subject:   Reply with quote

yes, there are two bleeder valves on the 3.4, one on the thermostat housing (the part you had to take off to get to the t-stat) and the other one is at the top of the t-stat bypass pillar that comes off the water pump.

Coolant flows front to back (left to right) in the engine so bleed the bypass pillar first then once the t-stat is open, bleed the housing bleeder.

Here's a pic:
http://img697.imageshack.us/im.....rvalve.jpg

The one on the right will be where that metal hose comes out of the t-stat housing right next to the upper radiator hose.

After bleeding both of these until a steady stream of coolant comes out, the system will purge the rest of the air by itself

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