: 1994 STS Overheating (I think)...

*Dr. Evil*
08-09-09, 06:27 PM
Hi Guys,

Im new here and desperate for info to fix my old man's pride and Joy. His '94 STS (32V V8, 106k miles) is overheating.

I cannot see and oil in the coolant and vice versa. Is this year susceptible to head gasket failure?

We replaced the rad cap and thermostat this morning. I topped off the coolant and idled the car in the driveway for 10-15 minutes. The coolant got to 205 degrees before he shut it off. Is that approaching hot? What should be the normal operating temperature (Im not sure and he cant remember...lol)?

I noticed the fans did not kick on. At what temperature are the fans supposed to come on? Where is the temp sensor to activate the fans?

Also, where the heck is the drain for the radiator?

Thanks in advance.

*Dr. Evil*
08-09-09, 07:17 PM
I cant seem to edit my post...

What coolant is this car supposed to have? It has the green stuff...is it supposed to have the orange stuff?

08-09-09, 09:59 PM
This a picture Submariner posted for me since my car's gauge doesn't show #'s. Operating temp for my while driving on the freeway is at the 12 o'clock position and when in a drive-thru or traffic it gets to 225...this is normal

My thread with some info:


08-09-09, 10:05 PM
Pre '96 came with green coolant. The drain is bottom left (drivers side). 205-215 is normal operating temperature. Fans turn on at 224 (or when the A/C is on).

*Dr. Evil*
08-09-09, 11:47 PM
jcresciSTS - it has the digital coolant temp indicator

Ranger - Thanks very much.

Is there a head gasket issue on the 1994 model year??

08-10-09, 12:40 AM
Yeah, I guess I didn't make it clear that 205 is a normal operating temp...

As for the HG, its still susceptible just not as much as my year of STS...check view poll results to see how many for your car have been reported on this forum http://www.cadillacforums.com/forums/northstar-performance-technical-discussion/122898-northstar-headgasket-bolt-failure-please-let.html

*Dr. Evil*
08-10-09, 10:57 AM
Thank you - you guys ROCK...:beavis: :beavis: :ride: