Question about Chevrolet Corsica

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1991 corsica coolant leaking out of by firewall

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  • Chevrolet Master
  • 2,483 Answers

Let's hope the first fix is the right one!
You should have two heater hoses running from the engine to the heater core, which you cannot see under the hood.
Typically, the hoses are about 1 & 1/4 inch diameter, and black.
That part ( the heater core) is inside, under the dashboard, sort of behind the glove box.
The heater core is just on the other side of the firewall from the two hoses, which are usually "together" (means they are about an inch apart) where the hoses attach to the heater core through the firewall.
If the problem is coolant ( you can tell by the color and/or taste), you likely have a heater hose that is old and cracked and leaking.
Take a flashlight and look carefully, you should see sign of wetness around the ends of the heater hoses and maybe on the firewall.
Those hoses usually last about 10 years before needing replacement.
If you find one leaking, you should replace both of them, unless the other one has been changed recently.
If you change them, you'll need to drain the radiator coolant and the hoses and collect the coolant for reuse or disposal.
I would also put on new stainless-steel band clamps.
Remember when you put it all back together, you will need to "burp" the air out by running the engine with the heater on full for about 10 minutes at a medium speed to get the water pump to pump accumulated air out.

Posted on Jan 13, 2013

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Posted on Jan 02, 2017

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BCAS1298
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SOURCE: coolant leaking by the firewall in the engin compartment

Check in the very back of the cylinder head's by the fire wall, there's a coolant pipe that run's from one head to the other, it's hard to get to but with a mirro you can check it.

Posted on Jul 01, 2010

  • 422 Answers

SOURCE: coolant leak 1991 mazda navajo

if you smell antifreeze ,and belive me youll know its antifreeze ,inside the car or the windshield will fog up when defrost is on ,you have bad heater core

Posted on Aug 26, 2008

betz73
  • 298 Answers

SOURCE: Coolant leak

There is a hard line on the back side of the engine block and the hard line sometimes cracks. i would check that line and see if it is leaking. If is not that hard line check your heater core hoses.

Posted on Nov 07, 2008

foskorider
  • 79 Answers

SOURCE: Coolant leaking

that is the heater core hose change the clamp to an adjustable clamp or change the hose and clamp

Posted on May 18, 2009

  • 784 Answers

SOURCE: I have a coolant leak to the right of the water

There is a gasket between the interface of water pump housing and the engine mounting surface. if you have to change the gasket then replace the pump the whole thing cost only 40 bucks for the parts. Try to tighten the mounting bolt to see if it help. However, make sure where the leak is coming from, Sometimes, the leak from not tightened hose clamp causing a leak then it splashes onto some place else when the car moves. Attached here is a picture to show the gasket.a873bd3.jpg

Posted on Dec 28, 2009

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Coolant leak at firewall (outside) on 1991 4.9 F150. Comes out at the bottom of the housing mounted to the firewall.


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I have a 1994 chevy corsica..The coolant is leaking out from a hose by the fan..how do i check to see where the leak is coming from


Some parts houses will rent coolant pressure tester,Sometimes for free with refundable deposit. pressurize system at radiator cap with radiator and reservoir full. Look for white residue from dried coolant. You will probably need to look in the area where you see coolant leaking. Most likely you will find a hose leaking , could possibly be leaking from radiator

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I have water leaking from the bottom of my dash on the passenger side of my 1991 cadilac broughan, what could be the problem


It's probably the core in the heating system. Coolant from the radiator is circulated through a very small heater core inside the car to provide heat. It will probably leak worse if the heater is turned on, since that allows pressurized coolant into the heater. The fan speed won't matter, just whether the heat lever is set to Hot or Cold.
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1 Answer

Heater core 1991 corsica needs to be replaced. how do i get to it?


1991 VEHICLES
  1. Disconnect the negative battery cable.
  2. Drain the cooling system into a suitable container.
  3. Properly disable the SIR system, as outlined earlier in this section.
  4. Remove the instrument panel as outlined in this section.
  5. Remove the screws and floor outlet, turning clockwise and to the right to release from the rear floor air outlet.
  6. Raise the vehicle and support it safely.
  7. Detach the heater hoses from the heater core.
  8. Disconnect the drain tube elbow from the heater core cover.
  9. Carefully lower the vehicle.
  10. Unfasten the retaining screws, then remove the heater core cover.
  11. Remove the core screws, clamps and heater core from the vehicle.
e9c0b51.jpg

Fig. : Exploded view of the heater core and related components - 1991-92 vehicles without A/C


To install:
  1. Reposition the heater core and install the straps and screws.
  2. Install the heater core cover and attaching screws.
  3. Install the floor outlet and retaining screws.
  4. Install the instrument panel.
  5. Raise the vehicle and support it safely.
  6. Connect the heater hoses to the heater core.
  7. Carefully lower the vehicle.
  8. Fill the cooling system with the proper type and amount of coolant.
  9. Enable the SIR system, as outlined earlier in this section.
  10. Connect the negative battery cable, then start the engine and check for coolant leaks. Check the coolant level, and add if necessary.

Hope this help (remember rated this post). Good luck.

May 15, 2010 | 1991 Chevrolet Corsica

1 Answer

I have a coolant leak to the right of the water pump on a 1991 Chevy Corsica 3.1L engine. Is there a gasket there? It has 2 star bolts holding it down I think.


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Dec 28, 2009 | 1991 Chevrolet Corsica

1 Answer

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Dec 02, 2009 | 1991 Chevrolet Corsica

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Regards, DT

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May 01, 2009 | 1991 Chevrolet Corsica

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Coolant leak


There is a hard line on the back side of the engine block and the hard line sometimes cracks. i would check that line and see if it is leaking. If is not that hard line check your heater core hoses.

Nov 07, 2008 | 1991 Chevrolet Corsica

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