Question about 1996 Pontiac Grand Am

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96 grand am gt 3.1 v6 heater bypassed?

When i bought the car i was told "heater does not work. it was bypassed through the manifold". what does that mean and what steps do i take to see what is missing or how to correct it. how 2 check if i have a heater core? i'm a mom w/ 2 repair manuals DIY help

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Hi. I think i talked to you before about this. That means, the heater core was either leaking or he couldn't get it to shut off. So, he took one end of one heater hose, off the heater core, and one end of the other heater hose off the intake manifold. He looped the one from the heater core , back into the engine where he removed the other one from. Probably then he would have looped the one from the heater core, right back into the heater core, or removed it completely. You heater core is on the passenger side of the firewall. You will either see 2 bare pipes, about a 1/2 inch across, just sticking out of the fibreglass, or you will see a heater hose looped there. If there aren't any pipes sticking out of the holes, he has removed the heater core, but it sounds like he was too lazy for that.
The only way you're going to figure out what the problem was is to hook it up again the right way, and see what happens, or give the guy a call if you still have his number.
If it leaks, you're goin g toneed a new one. If it won't shut off, it could be a number of things.

Posted on Jun 21, 2009

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If the A/C works and blows air through the vents, then this should be an indication that the heater core is bypassed. What might have happened is that a previous owner had a problem with the heater core, which is located below the dash, probably behind the radio and air conditioner controls. The heater core is recieving the engine colant mixture that is cycling through your engine. If it was leaking or there was another problem, the cheap easy repair is to bypass it. What you need to do is find the heater core which should be near where I described, and remove it and check for any signs of leaking or blockage. If it is corroded on the inside, then you should go ahead and buy a new one. If it was bypassed, then it shouldnt have any hoses connected to it. When you install a new one, if needed, you will have to get under the car and find the hoses that are connected together with a small step down plastic piece. Disconnect those from each other, and install the heater core. The hose ports for the heater core will go through through the firewall, then you can connect the hoses to the ports. Job finished.

I hope this solves your problem.

Posted on Jun 21, 2009

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The heater core was probably leaking and the person disconected the lines from the ewngine its a very hard job to replace it and expensive find a friend who is willing to fix it for you

Posted on Jun 21, 2009

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1 Answer

How can I bypass the heater core


not sure if this is what you are after but try this link..
Step 3: Connect the Hoses Together. Use a hose connector or hose coupler to attach the two ends of hose together. That way, the anti-freeze that would be routed through theheater core will instead just go through a short loop of tubing.

How to Bypass a Car Heater Core ' DoItYourself.com

www.doityourself.com/stry/how-to-bypass-a-car-heater-core How can bypass the heater core Google Search

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Heater doesnt work but ac does


Assuming the fan blows OK but you have no heat. Go to the firewall and notice where the heater hoses enter and exit the cabin. You'll notice a metal manifold and also a rubber bypass hose that connects the two. This bypass hose is a design problem and causes the coolant to bypass the heater core which is located inside the cabin under the dash. Over time, the heater core gets blocked by gunk and you'll get no heat. All the coolant flows through the bypass hose when this happens. The fix is to flush the heater core itself. It's difficult to access at the firewall, so I disconnect the two hoses at the engine itself and attach a garden hose to flush it. Before doing this you must clamp (vice grips) the bypass hose so that all of the water goes through the heater core.

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I have a 96 pontiac grand am 2.4 l leaking coolant left side of vehicle corner of rear of engine under exhaust manifold can pressure test cooling looses very fast but cannot pinpoint leak


One of two places the Coolant will escape from! Check all of ur hoses . For soft or swollen ! These engines are notorious for head problems!

Oct 29, 2011 | 1999 Pontiac Grand Am GT

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I have a 96 grand am and it started leaking coolant from somewhere around the manifold, i can't tell exactly where it's coming from. Does anyone know it that could be the termostat?


If its a v6 engine and the leak is by the intake manifold, then you need to replace the intake manifold gasket. This is a very, very common problem on all of GM's v6 engines. It will cost you about $350-$400 for this repair.

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How to replace an intake manifold gasket on a 1996 gmc jimmy


Hello,

Here is a detailed summary on the procedure of how to replace the intake manifold gasket on a 1996 gmc jimmy;
REMOVING THE UPPER INTAKE MANIFOLD(PLENUM)
STEP 1 Disconnect Battery (may not be absolutely necessary, but a good practice to avoid shorting a positive wire to ground).


STEP 2 Remove serpentine belt.

STEP 3 Drain the coolant.

STEP 4 Remove air cleaner ducting and disconnect wires.

STEP 5 Disconnect throttle linkage and bracket.

STEP 6 Disconnect cruise control cable.

STEP 7 Remove brake booster vacuum hose at manifold.

STEP 8 Remove PCV hose.

STEP 9 Remove ignition coil and bracket.

STEP 1O Remove purge solenoid and bracket.

STEP 11 Relieve fuel pressure at test port.

STEP 12 Remove fuel lines and bracket.

STEP 13 Remove upper intake manifold.

REMOVING THE LOWER INTAKE MANIFOLD
STEP 1 Remove the distributor and label the spark plug wires.

STEP 2 Remove heater hoses and bypass hose.

STEP 3 Remove upper radiator hose.


STEP 4 Remove EGR valve?

STEP 5 Remove sensors and bracket on right side.

STEP 6 Remove EGR tube, clamp and bolt.

STEP 7 Remove PCV valve (and replace).

STEP 8 Unbolt A/C compressor and move it aside.

STEP 9 Loosen compressor bracket and slide forward, but do not remove it.

STEP 10 Remove alternator bracket bolt (or remove alternator and set aside)

STEP 11 Unplug all vacuum lines from intake manifold.


STEP 12 Unplug all electrical connectors from manifold.

STEP 13 Take note of the intake manifold bolts and mark the location of the bolts.


STEP 14 Remove intake manifold bolts, and manifold.

STEP 15 Clean mating surfaces

THE MAIN INSTALLATION
STEP1 Set the new gaskets in place and apply silicone to flat areas on front and rear of engine block.

STEP2 Apply thread locking compound to manifold bolts.

STEP 3 Install the manifold and tighten bolts to 35 ft-lbs, in proper sequence.

STEP4 Install the distributor.

STEP5 Install the upper intake manifold.



The remaining installation procedures are basically the reverse of removal.


Have a nice day.

Dec 04, 2010 | 1996 GMC Jimmy

1 Answer

Belt routing diagram 1999 pontiac grand an gt v6


i belive this is the same as a 96 ? which has an auto tensioner towards bottom of engine towards rear of engine

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