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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 04-22-2005, 12:52 PM   #1
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Default Overheating SSEI

Got a couple questions on our 95.

It will overheat when still, but not going down the road, so immediately I assumed fans. after some testing I believe I am correct as when the AC turns on they come on, but if you don't use the A/C they wont come on.

Since I know the fans work I got a Engine Coolant Temp switch and fan realy. I can't find these things in the engine compartment ANYWHERE

Anyone got any help or advice as to where to find these things??

BTW it has 109k and is BONE STOCK

Thanks

Chris
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Old 04-22-2005, 01:32 PM   #2
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BTW the fan relay that we got(around $9) from advance has 5 prongs........(does not look like the ones under the hood in the Maxi Center) it has 5 prongs ....3 on one side and then 2 on the other.



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Old 04-22-2005, 11:37 PM   #3
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95, I too saw that relay on Advance Autos system. Never found it under my hood. The two relays you are looking for are in the under hood fuse center. The two furthest to the driver side of the car. Check for simple bad contacts by taking them off and on a few times. My Advance Auto did not have these and could not get them. I grabbed a couple spares out of the junkyard to have on hand. The temp sensor for the pcm is located directly under the TB on the driver side of the motor. Take off the air box tube going to the TB and it is reasonably accessible.

One other thought. My gauge cluster was inaccurate. If possible have a scan tool hooked up and monitor your temperature. The fans come on at about 215, or check to see if your gauge is correct. My guess is either the sensor or your gauge is inaccurate.

Easy way to tell is if you are bone stock then you should have a 195 degree tstat. What temperature does the gauge read when cruising 40-70mph constant? If more than 200-205 I would wonder about the accuracy of the gauge. At that point subtract the temp it reads from 200 and add that to 215 (fan on temp). When temp reaches this number the fans should kick on. However as I mentioned, I was afraid to perform this test and did not want to overheat my car. A buddy hooked up his scanner and the fans came on at 215, while my gauge was in the RED. Gauge has been moderately fixed.
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Old 04-23-2005, 12:30 PM   #4
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Good info!!..

I changed the relays, which were good, and also changed the coolant temp switch.


Neither one fixed the problem.

My next concern is the accuracy of the guage. Where is the sender for that at?

So far I have checked the water(good), checked both relays which are good, changed the coolant temp switch, and made sure the fans work VIa tha AC.

I believe the only thing left is the guage itself. I need a snapon for sure now.


Thanks for your help


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Old 04-23-2005, 08:18 PM   #5
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You may need a scantool to check the Temps and to see when the PCM is calling for the fans to turn on... They should come on at 220-227F or so...

When you turn on the AC the PCM should call for the fans to turn on at low speed, and later if required the PCM will turn on the high speed relay as well... The Relays are computer controled.. If the fans do come on at 220F or so then the temp sender, PCM, Relays and the like are functional...

Good Luck

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