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Old 11-25-2012, 09:54 AM   #1 (permalink)
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[report] replace thermostat

Hi everyone, I report you today`s job.

[condition]
Recently outside temp will be down day by day, but mine temp keep 212~220F night and day.
Fan working very well, but temp did not come down under 210F.
I noticed when stop signal, temp come up over 220. then start the car and open wide gas pedal when temp down under 210F moment.
One day I try this things what stop the car, engine running.
wait reach over 210F. I kept 2500RPM engine running but no car running.
Somehow engine temp down soon. I checked inlet hose. that was cool.
I decided that trouble cause is "thermostat" .

[job description]
I try access to thermostat directory. At first I removed wiper arms.
them removed front black wiper motor cover.



But this aria has narrow space. I used 1/4 wrench and universal joint.



I could see thermostat after removed 2 bolt (10mm) from water neck.




L=old thermostat R=new one. new thermostat shape was different old one.



I reused coolant. Because I was changed coolant just 2 month ago.



I used hand vacuum pump when re-fill coolant. This method can remove air babble too easy.

[result]
Outside temp was 59F today. I went to test drive.
DIC indicate 186~191F. keep this temp all day long.
Fan has never come up today.
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Last edited by Gordon shamway; 11-25-2012 at 09:56 AM.
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Old 11-25-2012, 10:19 AM   #2 (permalink)
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great write up. how did you use the hand vaccuum pump?
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Old 11-25-2012, 10:53 AM   #3 (permalink)
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where are the thermostats made? Not that it now but why did u drain the antifreeze...of course, u will loss some when u take off the hose to expose the thermostat..but most remains...remember, the fault finder always find fault even in paradise...just wanted to put my 2 cents in.

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Old 11-25-2012, 10:53 AM   #4 (permalink)
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Did it fix the problem?
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Old 11-25-2012, 12:13 PM   #5 (permalink)
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Nice job, did you try a 180*F TStat?
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Old 11-25-2012, 05:14 PM   #6 (permalink)
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Well done gordon! Those T stats are a pain to fix. Glad to see you did yours the easy way be removing the cowl. IIRC the repair manual wants you to remove the water pump, but that is necessary IMO.
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Old 11-25-2012, 06:05 PM   #7 (permalink)
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Gordon,
Thanks for posting. 1 more great post.
LLLFLY
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Old 11-25-2012, 07:10 PM   #8 (permalink)
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<|V3nom|

Please check under the URL. It`s my old post.
This method is very easy and authenticity remove air bubble from engine.

Change coolant original method!
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Old 11-25-2012, 07:26 PM   #9 (permalink)
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<marlboromike
I do not know where are the thermostat made, but I imported this one from GM OEM parts. (Mexico ?)
I drain the coolant from under the radiator drain plug. You should open radiator cap during draining coolant. This was my case that approx 1 gallon drain out from radiator.
Of cause I loss coolant from water neck and hose. Approx 0.5L in my case.
If you have any question, tell me again.

Quote:
the fault finder always find fault even in paradise...just wanted to put my 2 cents in.
If nobody looks for a fault, I will think that technology does not improve.
I appreciate you so much!
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Old 11-25-2012, 07:33 PM   #10 (permalink)
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<carnut122
Yes of coarse! Now coolant temp keep among 185~191F in the city driving.
If you have same issue, you can find result easier. You should touch radiator inlet
hose (under radiator driver side) when engine temp keeping normal operation temp.
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Old 11-25-2012, 07:41 PM   #11 (permalink)
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<Starkie
At first I check original thermostat temp, that marking say 180F.
New type thermostat operation temp was same temp, 180F.
I guess our SKY thermostat system use “bottom bypass” type.
This system can adjusts temperature gradually. So this system setting are little bit low. (Old V8 select 190F "inline" type)
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Old 11-25-2012, 07:51 PM   #12 (permalink)
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<miller11386
Thank you for your comment!
Ya, now my fear are water pump trouble.
Someday I will have to replace water pump, I will report my job again.
To tell the truth I keep water pump and all gasket and O-ling already.
But it is so tough job. All turbo charged system before replace water pump.
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Old 11-25-2012, 07:53 PM   #13 (permalink)
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Quote:
Gordon,
Thanks for posting. 1 more great post.
It`s my pleasure
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