Thermostat/heater performance?

[MGregoir]

I think I have a lazy thermostat, it does its job approximately but is slow to close when it has to and it is hampering heater performance.

Who makes a good thermostat? I'm thinking SuperStant but I also wonder who makes the NAPA ones, and what the quality of the Delco part is.

While I have this apart, I am going to replace my coolant temperature sensor as well because I believe that it is not working properly, causing me some starting issues in certain temperature ranges.

 

[The Critic]

I just replaced the thermostat in my Saturn with a Stant 195F. Mine was exhibiting the "lazy" syndrome as well, mainly due to a weak spring. The car runs a tad warmer than it's supposed to, so I think the thermostat opens a bit on the late side. The NAPA thermostats are made by Stant as stated on their website.

 

[OVERKILL]

Motorcraft T-stats are very good quality.

 

[Colt45ws]

I have a motorcraft thermostat along with a cap and 3 gallons of Zerex G-05 in the garage.. Going to flush and fill soon. My thermostat is doing the same thing. Very slow. Supposed to be a 192F, but even if it hits 192F it will cool down into the 180s quickly once you start moving.

 

[Chris142]

Originally Posted By: The Critic
I just replaced the thermostat in my Saturn with a Stant 195F. Mine was exhibiting the "lazy" syndrome as well, mainly due to a weak spring. The car runs a tad warmer than it's supposed to, so I think the thermostat opens a bit on the late side. The NAPA thermostats are made by Stant as stated on their website.
Stop depending on the stock temperature guage. They are rarely correct.

 

[mechtech2]

You may have 2 coolant sensors.
One for the gauge, and one for the computer.
So get the right one.
A NAPA or premium Stant should be fine. Same for the factory part.
Avoid the cheap ones - spend a few more$.

 

[oldmaninsc]

Originally Posted By: The Critic
The NAPA thermostats are made by Stant as stated on their website.


Yes, and as stated on the box.
I just bought one a month or so ago.

I am also surprised at people who say how bad Stant thermostats are. From that same Napa web site:
"Stant is the primary supplier to most of the world's car manufacturers"

 

[eljefino]

Superstats are worth the $$$.