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[report] replace thermostat

10K views 12 replies 7 participants last post by  Gordon shamway 
#1 · (Edited)
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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#9 ·
<marlboromike
I do not know where are the thermostat made, but I imported this one from GM OEM parts. (Mexico ?):confused:
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.

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!:cheers:
 
#10 ·
<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.
 
#11 ·
<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)
 
#12 ·
<miller11386
Thank you for your comment! :cheers:
Ya, now my fear are water pump trouble.
Someday I will have to replace water pump, I will report my job again. :willy:
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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