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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