Hey guys, I've recently swapped my 3.0 to a 3.5 out of a TJ Sports. Now the issue I'm having is with cooling, or rather too much of it...lol

With my 3.0, it ran perfectly all the time, the temp gauge never moved from half way after initial warm up, regardless of the ambient temperature or how the car was driven.

Now after the conversion (using my old cooling system) the 3.5 takes a while longer to reach operating temperature, and on the colder nights sits just under half way. Now this isn't such a big problem, but once you hit the freeway the temp starts to drop a fair bit, sometimes to just under a 1/4 way up the gauge.

I'm using my old thermostat from the 3.0, and from what I can see in the Mitsubishi service manual there doesn't seam to be a different type in the 3.5.

Does anyone know possible issues that could be causing this?

maybe your thermostat is playing up now?

had similar problem in my EL falcon, the thermostat stayed open so continues water flow kept the temp low

maybe your thermostat is playing up now?

had similar problem in my EL falcon, the thermostat stayed open so continues water flow kept the temp low

It's possible, I guess it might not be fully closing, hence why it's not so bad around town, and too cold on the freeway.

Definately sounds like thermostat, like Ashneel said.

Might even be missing altogether.

Or you fitted it wrong way around....

i have this excat issue aswell just never really thought nething of it until u mentioned it
it takes longer then usual to heat up and doesnt sit in the same spot it used to but just below

i have this excat issue aswell just never really thought nething of it until u mentioned it
it takes longer then usual to heat up and doesnt sit in the same spot it used to but just below

Well I found the issue lol


Might even be missing altogether.

The Mechanics forgot to swap it over from the 3.0 as they thought the 3.5 already had one.