Hey everyone, officially new to the site but have been a lurker for a long time. On my 2nd LS and 12th year of LS ownership. Anyway, I have an '06 LS, and ever since I replaced the thermostat (used a Motocraft part) I can't get the engine to warm up when running down the highway. The temp gauge will only go up to the bottom of the normal range. When I drive it around town it jumps up to the middle of normal like it should. Go back on the interstate and it drops right back down. I DO get heat out of the heater so I don't think it's related to the HVAC. I thought maybe I put too much straight antifreeze in it when I changed the thermostat so I drained about a gallon out and refilled it with straight water. No real change. The only other thing I can think of is the thermostat is stuck open, but thought I'd throw this out to the forum before swapping it out again.
Underheating Problem??
- Thread starter gkhize
- Start date
joegr
Dedicated LVC Member
No, there's only one correct way to put it in. There's at least one or three incorrect ways as well.
Here's the correct way.
http://deneau.info/ls/s6x~us~en~file=s6x33007.htm~gen~ref.htm
Also, there's a really good chance the thermostat housing is broken now.