1968 Pontiac Firebird Runs Hot HWY Driving

20

Asked by Aug 12, 2011 at 02:56 PM about the 1968 Pontiac Firebird

Question type: Maintenance & Repair

1.) I am considering buying a 1968 Pontiac Firebird. The owner mentioned the car runs hot on the HWY because it has 4/56 gears or because it needs a larger cooling fan.  I thought maybe a more efficient radiator may solve the problem.
2.) The owner mentioned the real seal leaks oil.  The car sits for long periods of time. He said when the car heats up the seal swells and that seals the leak.
3.) Short of changing the 456 gears I would think a 5 speed or 6 speed transmission would compensate for the higher gears.
I only saw pictures of the car so far and spoke with the owner. From the pictures the car looks very nice.
I don'd mind replacing the fan or the radiator, or eventually replacing the 4 speed with a six speed.  I don't want to have a major problem after buying the car.
Looking for advice especially with the hot running car on the HWY.

6 Answers

50

4.56 gearing will not cause the overheating. It's normal for these cars to over heat. There are methods available to fix this issue. For example, fan shroud and a flex fan or clutch fan and a/c filler panels should be enough to cool her down. Older engines will have a real seal leak. The seal available back in the day do not last much more than 10 years. You might need an engine rebuild at this point anyways so it can be fixed then. Heat WILL NOT seal it up. You want to focus on the condition of the sheet metal. Rust is your worst enemy! Come see us on the fgf forum for more info. www.http://firstgenfirebird.org/forums Brian

1 out of 1 people think this is helpful.
20

Brian thank you for your help and response. Greatly appreciated.

25

If the timing is to far advanced on a Pontiac engine they tend to run hot. Check the ignition timing first.

20

Dennis thank you for your advice.

15

put on a set of dual fans with manual switch

135

sounds like its probably time to do some work on the top half of the engine but if you want to band-aid it ,a good flush and replace with performance radiator fluid , twin electric fans (might wanna install a automatic switch instead of manual , Dont fool your self its easy to forget to turn it on) and a performance thermostat , dont ever ever ever use any kind of miracle cure in a bottle unless "lucas" makes it and use as directed

Your Answer

Add photo

Related Questions

  • 1968 Firebird won't turnover after a trip, but will if left for an hour or so 4 answers

    I have a 1968 Firebird. It will start OK. If I then drive any distance and turn it off, I get nothing, no cranking. If I leave it alone for an hour or so, it will start again??

    1968 Pontiac Firebird

    -

    Maintenance & Repair

  • 68 400 FIREBIRD COLD START FINE PARK AND RESTART BAD LIKE ITS FLUDED 4 answers

    THE CAR WILL COLD START AND DRIVE ANY WHERE BUT WHEN PARKED FOR A SHORT TIME IT STARTS HARD LIKE ITS FLUDED AND RUNS BAD OR COULD SHUT DOWN . I WAS TOLD VAPER LOCK BY 1 MECHANIC , HEI MODUIAL BY ANOTH...

    1968 Pontiac Firebird

    -

    Maintenance & Repair

  • 92 pontiac firebird 305 chugging 4 answers

    I have a 92 pontiac firebird with a 305 it recently started acting constricted... as if a fuel filter or cat was clogged up

    1992 Pontiac Firebird Convertible

    -

    Maintenance & Repair

  • 92 Pontiac firebird v6 9 answers

    I have a 92 Pontiac firebird v6. Driving it one day and slammed it in park while barley moving. Turned it off and and it hasn't really started since. Replaced timing chain, distributor cap and ro...

    1992 Pontiac Firebird Base

    -

    Maintenance & Repair

  • Drivetrain of the Firebird 1 answer

    Is the 1986 Pontiac Firebird a rear wheel drive car?

    1986 Pontiac Firebird

    -

    General

Firebird

Looking for a Used Firebird in your area?

CarGurus has 817 nationwide Firebird listings starting at $3,800.

ZIP:

Search Pontiac Firebird Questions

Pontiac Firebird Experts

#1 Samuel Moore
Samuel Moore
Reputation 910
#2 dandyoun
dandyoun
Reputation 760
#3 Justin Hatfield
Justin Hatfield
Reputation 730
View All

Related Models For Sale

Used Chevrolet Camaro
659 Great Deals out of 39,411 listings starting at $2,995
Used Ford Mustang
682 Great Deals out of 38,461 listings starting at $1,963
Used Chevrolet Corvette
354 Great Deals out of 20,300 listings starting at $3,688
Used Pontiac GTO
9 Great Deals out of 493 listings starting at $5,900
Used Dodge Charger
527 Great Deals out of 29,010 listings starting at $2,275
Used Pontiac Grand Prix
26 Great Deals out of 3,754 listings starting at $1,195
Used Chevrolet Impala
929 Great Deals out of 36,399 listings starting at $1,800

Used Cars For Sale

2002 Pontiac Firebird For Sale
5 Great Deals out of 127 listings starting at $6,497
2001 Pontiac Firebird For Sale
78 listings starting at $7,599
2000 Pontiac Firebird For Sale
3 Great Deals out of 86 listings starting at $3,800
1999 Pontiac Firebird For Sale
53 listings starting at $4,990
1998 Pontiac Firebird For Sale
44 listings starting at $4,999