Coolant flow direction? - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 General Tech Q&A > General

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  #1  
Old 04-14-2009, 05:28 PM
Double D Double D is offline
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Coolant flow direction?

Can someone verify which way the coolant flows. I assume it flows from the thermostat(bottom hose) to the bottom of the radiator. The spring on the thermostat is in the engine, therefore in contact with coolant at different temperatures, it opens, sending coolant to the radiator.
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Old 04-14-2009, 05:38 PM
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MajesticLT03 MajesticLT03 is offline
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I think it uses reverse Osmosis .. dont quote me though
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Old 04-14-2009, 05:39 PM
Double D Double D is offline
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When my osmosis ran in reverse I plugged up.
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Old 04-14-2009, 05:42 PM
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MajesticLT03 MajesticLT03 is offline
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yes I believe it enters through the lower hose and cycles through and comes back out through the top hose


but I may be wrong... god knows something else GM decided to overthink something stupid
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Old 04-14-2009, 06:12 PM
WOOLUF1952 WOOLUF1952 is offline
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It would have to come out of the engine at the t-stat. If the water went into the t-stat from the radiator it would not be hot enough to open the t-stat.
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Old 04-14-2009, 06:22 PM
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Robert1101 Robert1101 is offline
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Quote:
Originally Posted by WOOLUF1952 View Post
It would have to come out of the engine at the t-stat. If the water went into the t-stat from the radiator it would not be hot enough to open the t-stat.
Remember this is GM eng. doing this......... Who knows what they are thinking....... Maybe it is cold fluid that makes it work.......
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Old 04-14-2009, 06:24 PM
Double D Double D is offline
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It runs backwards as compared to other GM vehicles. Typically the T-stat is on top, with the spring inside the block, so it runs into the rad via the top hose. But this runs into the rad via the bottom hose. Just wanted to make sure I was not over thinking it.
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Old 04-14-2009, 06:25 PM
WOOLUF1952 WOOLUF1952 is offline
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I forgot about the GM Engineer Factor.
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Old 04-18-2009, 11:02 PM
lfb57 lfb57 is offline
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Fire it up and see which hose is hotter.

I'm gonna do this tomorrow - on my other vehicles the hot coolant entered at the top.
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Old 04-19-2009, 10:29 AM
drolds72 drolds72 is offline
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Per my Haynes manual, the coolant leaves the engine block thru the T-stat. (which on traditional gm small blocks is front and center at the top)
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