EVILXJ

im using a mr gasket 195 degree

djb383

Seems strange that changing a stat would allow it to pass. U say overheating but then u say 210-215.....those numbers are not overheating. Did someone diagnose overheating????

CCKen

Just looked at the 1994-1996 XJ parts catalog. This is what it calls up for the XJ thermostat.

Part number 5202 8446, 180 Degree, Severe Use

It lists a different thermostat (different part number) but doesn't specify a degree setting.


94-96 is the only year spread where a 180 degree stst was listed. 88-96 lists a part number 83501426 stst but no degree setting. Starting in 97, the catalog specifies a 195 degree stst.

cruiser54

The big deal with the factory stat, at least the 195* version, 83501426, is that it has a "jiggle valve" which gets mounteg at 12 o'clock. Temperatures are way more stable than any other stat I've used recently. Fast warm up in winter and stable at 210* in summer.

djb383

Is the jiggle valve open or closed, when the (cold) motor is running?

cruiser54

I' haven't been able to see inside my thermostat housing with the engine running. LOL.

It's just a hole in the flange of the stat that holds a small BB looking thing kinda like in a snorkel.

djb383

Which side of the flange is the BB on......the head side or the cover side?

cruiser54

I don't remember. Neither really. It's in the middle and can "jiggle" back and forth. Go buy one!! LOL.

djb383

Pretty sure it would b on the head side.....so it will seal the hole when the motor starts.

Kalali

Correct. It is basically a one way valve that allows some (little) coolant flow back towards the head when the pressure is reversed/equalized across the t-stat.

cruiser54

I don't think it seals all that well. You gotta see one.
One thing I do know is that after 3 Stant SuperStats, all my Jeeps now get up to temp very quickly in winter and stay right at 205* on the dash gauge in the summer in Arizona with AC on in 95* weather. All 3 have new radiators, nothing special, within the last 2 years.

William-Anastasia Kisepi

been looking around for a 185 thetmostat for my 98 xj cant find one

cruiser54

Why you would want one is beyond me, but they're the same as most old Chevies.

BlueRidgeMark

I think I understand that. They see, "thermostat" and think, "controls the temperature in my house", so they assume it works the same way in a vehicle.

And if you are doing mostly very short runs, it may make your engine run cooler. Why?

Simple, you start with everything cold. We all know (I hope) that running with NO thermostat will cause your engine to take longer to heat up. If you start with, say, a 160 thermostat, the heatup is delayed for the same reason, but not as much. The t-stat will open before your engine gets to optimal operating temperature, so it will take longer to heat up. If you only do short runs, you'll see that your engine "runs cooler" because you never get to full operating temperature. What do you do then? When the subject comes up on a board like this you'll toss in your two cents and the myth gets reinforced.

Then, if they take a longer drive, the temp goes up to the equilibrium point, and they think it's "overheating".

That's my story and I'm stickin' to it!

BlueRidgeMark

Three mistakes:

1. Hijacking a thread.
2. Not reading the thread and understanding the information in it.
3. Thinking you want a 185 thermostat.