Why the 180 degree thermostat?
Legend
Joined: May 2005
Posts: 8,663
Likes: 8
From: Central Oklahoma
I thought I remember reading long ago that certain cylinders run hotter than others. This lead to pinging in those particular cylinders. One fix was to simply put a lower temp t-stat in.
I do know that my 5.2l seems happier when towing w/ the 180 in vs the 195; I do have to swap it out in the winter if I want decent heat in the cabin (but I think the shop that did the heater/evaporator core messed up the blend door or something...but that is another issue).
I do know that my 5.2l seems happier when towing w/ the 180 in vs the 195; I do have to swap it out in the winter if I want decent heat in the cabin (but I think the shop that did the heater/evaporator core messed up the blend door or something...but that is another issue).
Administrator
Joined: Apr 2010
Posts: 87,461
Likes: 4,218
From: Clayton MI
I think the closed loop tip-off point is well below 180 though..... on the GM's that I am most familiar with, it was 106*, and that was on a vehicle that did NOT have heated O2 sensors.... on the OBDII cars/trucks, with a heated O2, once it warms up, and is giving accurate readings, (just a few short minutes...) might just as well pay attention to it. (closed loop)
Some trucks WILL whine about the lower temp stat though...... they seem to feel that NOT getting to the expected 195, or thereabouts, is a problem.
Some trucks WILL whine about the lower temp stat though...... they seem to feel that NOT getting to the expected 195, or thereabouts, is a problem.
Amateur
Joined: Sep 2007
Posts: 32
Likes: 0
From: D-town, PA
The heat in my cabin sucks now that its winter. I installed the 180 t stat earlier this summer along with the sct tuner. Is this common for the heat in the cabin to drop significantly? It will eventually get warm after a good 15 minute drive but not like the blistering heat it had in the past with the 195 in there. I did have work done with the intake so I image the coolant was replaced by the shop. Could there be a bubble of air in the heater core?
Veteran
Joined: Sep 2010
Posts: 269
Likes: 0
From: Camp Hill, PA
If you were running open loop because of the lower tstat your mpg would be non existent. Plus there would be times you would be running really lean and other times rich. The motor can't keep an accurate a/f ratio without being closed loop. Open loop just dumps a predetermined amount of fuel to keep the motor running when it's cold and will only stay open loop for a few minutes.
Administrator
Joined: Apr 2010
Posts: 87,461
Likes: 4,218
From: Clayton MI
The heat in my cabin sucks now that its winter. I installed the 180 t stat earlier this summer along with the sct tuner. Is this common for the heat in the cabin to drop significantly? It will eventually get warm after a good 15 minute drive but not like the blistering heat it had in the past with the 195 in there. I did have work done with the intake so I image the coolant was replaced by the shop. Could there be a bubble of air in the heater core?
