running cool after coolant change

signalnc

Original poster
Member
Dec 28, 2012
249
My 2003 has been running cooler than normal since I got the coolant changed. I have no scan tool. The dash says it's running around 160 and my gas mileage is really bad, so not that the dash is exact, but I obviously have an issue. Could it be the ECT? I was thinking it is just the thermostat.

just as a side not I did tell the shop to change the thermostat when I had the coolant done and they didn't do it. I guess the trails of emails back and forth it was missed.
 

Mooseman

Moderator
Dec 4, 2011
25,335
Ottawa, ON
Could be thermostat (likely) or the temp. sensor. Not just your mileage can be bad but it can also kill your cat because it is running rich. Get both the stat and sensor changed at the same time since both are close to each other. Do it ASAP.
 

Mooseman

Moderator
Dec 4, 2011
25,335
Ottawa, ON
:thumbsup:
 

seanpooh

Member
Jan 24, 2012
461
I don't know why but it seems when we do a coolant flush the thermostat "suddenly" goes bad.
 

CaptainXL

Member
Dec 4, 2011
2,445
There really is no such thing as a "flush" with the 4.2 I6 engines. In order to drain all the coolant the thermostat housing needs to come off because it blocks the coolant from coming out the lowest point of the block. At this point you might as well replace the thermostat since it's off.
 

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