I have a 1987 Trans Am with the LG4 Motor. When I drive in the City the Temp stays normal at 220. But when I get on the highway it goes right to the red line. It never has really been in the red line, but it just hugs it really close. Does anyone know what the deal is? Thanks

 

Like all the thousands of other posts asking this same thing, it's because your lower air dam is missing or trashed. It's a piece of plastic about 5 or 6" tall that goes directly under the radiator and scoops air up into it. It's the thing that always scrapes (used to scrape?) on parking curbs and driveways.

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"So many Mustangs, so little time..."
ICON Motorsports

 

I second what RB said.

 

I third what RB & Glenn said.

 

Fourth - you need one of these...



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Later,
Vader
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"Let the bodies hit the floor!"
Adobe Acrobat Reader

 

That peice dose more to suck air through the radiator by creating a low pressure area behind the radiator than by forcing air up into the radiator. You need to have all the air-deflectors in place between the nose peice and the raditor support!
Been there, Done that.
Last summer my car would run hot on the highway but stay cool while idling until I corrected the situation with the deflectors behind the nose that help direct air through the radiator.

I now have a new problem with the engine running hot that I believe is related to a catalytic converter gone bad, (the CC rattles quite a bit) Can the CC be responsible for this condition?

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'84Z28/'92 305TPI
'92 complete rear suspension/PBR disc/Posi/3:42
Light weight 34.5mm stabilizer bar in front ($10 from wrecking yard)/
"wonder Bar" ($5 from wrecking yard)
23mm sta. bar in rear
Rear RS Springs (slightly softer than my Z28)
comp cam, flowmaster
TB coolantbypass/shutoff valve to heater core
powersteering cooler lines (liberated from another wrecked car of course)
MAT relocated
Ram-Air(home-made) gutted air-box
IROC ground effects/wheels GY245/50's
700R4 superior shift kit/ corvette servo(excellent shift kit btw)
home-made strut tower brace (cost $6)

Rebuilt engine and transplanted it myself.

Love this engine!

freshly painted OCT. 2000 Teal with two white stripes on the hood and deck lid

LOW performance people should drive low performance vehicles!

 

You know 84IROC you bring up a very interesting point that I wouldn't have thought of in a 100 years. Your suggestion would compare to an airplane wing that doesn't gets it's lift from the bottom of the wing as most people "think" but rather from the vacuum created above the wing because of the shape of the wing.

hmmmmmmmm..... anyone else care to kick in on this interesting theory?

PS However I will point out that it is possible that the deflectors behind the nose are not "stock" on all cars. On my 86 T/A I ordered "air deflector" thinking I was getting the air dam and I got the nose deflector. Upon installation of this piece I found that my car had never had one and had to rig it into place. There are 3 Pieces (at least on an 86 T/A) that make up the air flow and they are ALL called air deflectors. Nose piece ~ spoiler strip ~ radiator piece.

[This message has been edited by MikeInAZ (edited July 23, 2001).]