When you remove the rear seal under the hood does this let warm air into your car somehow cause "DAMN". After I did that you can feel warm air like your heater is on or something. I am thinking the vents above the firewall have something to do with this, am I correct? Thanks!

 

nope

 

It's possible. You could be getting warm air coming into the vents and when you drive it is forcing out of the vents inside.

You could try putting the weather stipping back on the rear of the hood and see if it stops.

 

I removed my hoods rear seal about a year ago and there is No extra heat coming into the interior even when the tempurature control is in the vent position, just outside ambient air temps.

 

Is your air dam in place below the radiator? There should be airflow from front to back from either the fans or from movement of the car, so hot air should be coming out the rear of the hood if the seal is removed. I'll bet 1987fbd has the airdam in place.

 

The reason you remove the hoods rear seal is to allow Cool Outside air to be sucked into the engine compartment from the High Pressure Cowl area. It's a poor mans Cowl Induction hood. Hot air does not vent out from there.

 

Hmmm......well the air dam should have nothing to do with the hot air that enters my cars interior as GKK pointed out. I think that my heat ducts must not be closing, I will have to check that out. Or I could just do what CraZ-28 said and put the strip back on and see what happens.. LOL

Thanks for the help guys!

 

GKK,

It depends on the aerodynamics of the hood. The air pressure is lower right behind a ridge (or cowl, or rear lip) on the hood but it is higher at the windshield because of the windshield's angle. On a typical hood then, the high and low pressure areas and vent intakes are in almost the same place, right at the base of the windshield. Therefore either high or low pressure may dominate depending on the airflow at the time. If the pressure is high and in the right place the hot air coming from under the hood could get pushed into the vent intakes. That's how I'm viewing the situation anyway.

1987fbd,

Another thing I just thought of is that some cars (depending on the year and design) are made to have a natural airflow through the interior to prevent exhaust vapor buildup inside. Maybe the vents are prevented from closing all the way for this reason?

 

Nice observation Sciguyjim, Very well could be the problem. Thanks again guys.

 

Would removing the seal alow the motor to cool down a little better? I have headers, so would the seal trick help me?

 

In my opinion it would, probably significantly if you have no other hood vents.

 

If you do remove your hood seal, ensure you spray some dry and go lubricant or something to protect the distributor cap and most wires around the firewall. When that stuff gets wet or damp, really gives you hell with intermittent stalls and hard starts.

Other than that issue, I took mine off and found the engine to run a whole lot cooler... no issue with heat inside...

 

ok yah samething happens in my car,
Im confused about what u all said
I got no idea what ur talking about

 

Specifically what don't you understand, and who said it?

 

What about a heater core shut off? I know that coolant still passes thru the core when the heater is off. If you installed a shut off vavle inline w/the core, you could turn it off during the summer and on in the winter. Not that hard to do. I have done it in many other cars, but not my IROC yet. Just an idea. TL

 

Problem solved, I put the seal back on and no hot air is entering my car. I noticed about a 5 degree bump in temp but not enough to worry about, I am still at about 210 and it is high 90's low 100's right now. :lala:

 

Congratulations! I'll refrain from saying I told you so. Earlier, someone asked if your air dam was in place. If not, replace it and you'll knock the heat down 10-20° more. My temp stays between 184-196° no matter how I drive (except sitting still). I have nothing special to help the engine. Even my rear hood seal is in place. The dam forces a lot of air up into the engine compartment.

 

I remember you saying you thought I had the air dam in place and that is why I was getting the warm air with the seal gone. Now you have me really confused. No I do not have an air dam in place but i am going to put one on real soon. Thanks again

 

Ok, let me try to explain again. With the air dam and rear seal both gone, the fans can push some hot air out the rear of the hood at low speeds. The air coming out is very hot because it's spending a lot of time under the hood. When driving with no air dam, the hot air coming out the hood rear may increase or decrease, but it's not going to be moving too much so it runs into the high pressure area at the windshield and has to find somewhere else to go. With the air dam, when driving the airflow is much higher through the engine compartment so what comes out the rear is both cooler and moving faster so it may push the high pressure area up the windshield a bit and away from the air vent intakes.

How's that? Does it make more sense now?

 

Quote from Sciguyjim:
Is your air dam in place below the radiator? There should be airflow from front to back from either the fans or from movement of the car, so hot air should be coming out the rear of the hood if the seal is removed. "I'll bet 1987fbd has the airdam in place".
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Enough said, my problem was originally hot air coming through air vents inside my car. Put seal back on and now problem is solved. Air dam with seal still no hot air, Air dam with no seal, hot air. No air dam and no seal, hot air. No seal = problem with hot air.

 

Whatever we did, we solved the problem, that's what's important. Hooray for us.

 

Thanks for your help Sciguyjim, yes we did solve the problem.
:lala:

 

ok u lost me there..
what seal?
and where?
The air dam= air intake right?

 

Dave, what we were talking about was how warm air from under the hood could come out the space along the rear edge of the hood if the rubber weatherstrip was removed. That was the "seal" referred to.

The air dam isn't really the intake but can be a part of the system. The dam is under the radiator. It scoops up cool air and directs it to flow through the radiator, and some towards the air intake for the engine.

With the "seal" removed, the force of air scooped up by the dam would push air through the radiator, across the engine and out from the rear of the hood, right in front of the windshield, where the air intakes are for air going into the passenger compartment. This is where warm air was coming from that was getting into the car.