Question about 1995 Buick LeSabre

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The plastic firewall on my 1995 Lesabre has become brittle and is breaking off. Am I possibly missing a heat shield above the exhaust pipe or behind the engine?

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  • jtuttle196 Nov 17, 2009

    I noticed after having the engine cradle retainers replaced on my '95 Lesabre that I could see some yellow insulation in the firewall directly behind the engine. Closer inspections showed that the plastic liner on the firewall has very brittle, as if heated too much, and had begun to break off in sizeable pieces. I am wondering if there is supposed to be a heat shield (perhaps "lost" in the repair shop) either behind the engine or above the exhaust pipe which is baking my firewall liner?

  • yadayada
    yadayada May 11, 2010

    have a dealer look, not sure what u are talking about ere.

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  • Buick Master
  • 6,826 Answers

This model is bad to have this happen,it is just bad design,matterial,take some auto air conditioner insulation tape,and put it across the holes,gently,it will work really well,it is a gummy black tape.auto parts sell it.

Posted on Nov 17, 2009

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Nov 17, 2009

    There is supposed to be a insulated blanket with reflective surface on it,on the out side,gludes to the evaporator box,that is all,but this is a on going thing with this year buick,heat,or no heat,even in the 95 cadilac deville,it does the same thing ,but on the top,then the side and the bottom,in that order.The auto parts will sell such a insulator,but the gummy tape will help hold it together

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I'm thinking that one is above exhaust pipe under firewall area..I believe its behind the silver heat shield..watch where the ac drip and go from there

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Hello vocalviixen,

The pipe that you referred to is the exhaust crossover pipe. Below I've included removal and installation instructions.

Also, the procedure for bleeding the coolant system is critical; if you need those instructions please post the question.

REMOVAL PROCEDURE
1. Disconnect the battery ground (negative) cable.
2. Remove the throttle body air inlet duct.
3. Drain the coolant from the cooling system.
4. Remove the inlet radiator hose from the engine.
5. Remove the thermostat bypass pipe.
6. Remove the exhaust crossover heat shield bolts.
7. Remove the exhaust crossover heat shield.
8. Remove the exhaust crossover pipe studs/nuts.
9. Remove the exhaust crossover pipe.
INSTALLATION PROCEDURE
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2. Install the exhaust crossover pipe studs/nuts.
3. Tighten the exhaust crossover pipe studs/nuts to 18 lb ft.
4. Install the exhaust crossover heat shield.
5. Install the exhaust crossover heat shield bolts.
6. Tighten the exhaust crossover heat shield bolts to 89 lb in.
7. Install the thermostat bypass pipe.
8. Install the inlet radiator hose to the engine.
9. Fill the cooling system with engine coolant.
10. Install the throttle body air inlet duct.
11. Connect the battery ground (negative) cable.


Regards,
netvan

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