Question about 1999 Oldsmobile Cutlass

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1999 Oldsmobile Cutlass V6 Overheating Problem

Thanks to all the responses I really do appreciate it. To answer to those who have responded. Yes the dexcool to water mix in the system is 50/50. The temp guage itself was my next thought as well. So I did replace that but still just as before the guage reads hot and upon a 7-8 mile drive all coolant is spraying out the overflow tube on the coolant tank. I do bleed the system correctly using the release valve,heater on while filling, and proper burping. So with the entire cooling system replaced. Replaced 2 thermostats,water pump,radiator,coolant tank,radiator cap,dexcool,hoses,temp switch. I will try the suggestion of the intake manifold gasket. Give me a chance to see what its lookin like inside.I guess. Any Other Thoughts Please?!

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  • taz250k Jul 28, 2009

    Yes The cooling fans are operating normally. I have replaced both coolong fan relays and all 4 coolong system fuses as well. It can't be the guage itself because when the car gets hot you can see the water just boiling out of the overflow tube.

  • taz250k Jul 28, 2009

    Yes the cooling fans are operating normally. I have replaced the all fuses,relays,and temp guage with new. So with the fans running,the guage running hot, and you pop the hood you can see the water just boiling out of the overflow tube. Entire cooling system has been replaced.

  • taz250k Jul 28, 2009

    Yes it is operating normally.

  • taz250k Jul 28, 2009

    Thats not what I want to hear. I pray it is anything but the head gasket. Would all cylinders compression test good withinternal coolant leak?

  • taz250k Aug 02, 2009

    No not really on the air bubbles while filling the radiator. What does that mean?

  • taz250k Aug 02, 2009

    yes everything is normal

  • Curt Downs May 11, 2010

    Is your cooling fan going on when the temp gauge starts to climb out of the 'normal' range?



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Head gasket ? Internal leak ???

Posted on Jul 27, 2009

  • Doug Windsor Jul 29, 2009

    More than 1 release valve ? Some engines have 2, first 1 on left hand side of engine ( looking at motor from front ), others also have a second valve on the right side near/ on the thermostsat housing. Check this before ripping the engine apart.

    Also, when pouring the coolant/water into the rad ( engine running ) is there a continous sign of air bubbles the whole time you are filling the rad ?



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Posted on Jan 02, 2017

Mr BrokRench
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SOURCE: Thanks to all the responses I really do appreciate

Hello Taz..might check the converter to make sure the exhaust system does not have excessive backpressure. Also make sure the electronic cooling fans are cycling...they should kick in and out. They are tied into the A/C system circuit with a relay.
The 3.1L and 3.4L V-6 Engine (VINs J, E - RPOs LG8, LA1) were known to have intake gasket failure. This was due to a bad gasket that was designed by had nylon in it...Over 400,000 of these were sold in Canada alone. The gasket has since been redesigned and torque specs recalculated. If you replace the manifold gaskets follow these guidelines.

Install a new design intake manifold gasket. The material used in the gasket has been changed in order to improve the sealing qualities of the gasket. When replacing the gasket, the intake manifold bolts must also be replaced and torqued to a revised specification. The new bolts will come with a pre-applied threadlocker on them.


An oil leak may result if the vertical bolts are not tightened before the diagonal bolts.

Diagonal bolts may require a crows foot to tighten.


1. Tighten the vertical lower intake manifold bolts (1) to 7 N.m (62 lb in).

2. Tighten the diagonal lower intake manifold bolts (2) to 7 N.m (62 lb in).

3. Tighten the vertical lower intake manifold bolts (1) to 13 N.m (115 lb in).

4. Tighten the diagonal lower intake manifold bolts (2) to 25 N.m (18 lb ft).

Good luck...i hope this helps.

Posted on Jul 27, 2009

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