Overheating

25

Asked by Apr 15, 2012 at 12:05 PM about the 1969 Pontiac Firebird

Question type: Maintenance & Repair

My 1964, 389 pontiac motor thats been bored out to a 410 has a very bad overheating problem.  All the obvious has been replaced; including the water-pump, thermostat, radiator and the hoses.  It appears to be building up pressure in the block, behind the thermostat.  Temperature reaches over 250 within a half hour afte startup.  WTF is wrong?

10 Answers

247,175

Did you replace your Radiator Cap when you installed the new Radiator? How's your timing?

1 of 1 people found this helpful.
Best Answer
7,415

how is the vaccuum advance? my former 70 Le Sabre would overheat like that and the buyer just replaced it to restore the engine.

1 of 1 people found this helpful.
2,985

was the spacer behind the water pump reinstalled, very important to get coolant flowing correctly

2 of 2 people found this helpful.
2,985

bbuilding preesure behind the thermostat, easy mistake is thermostat put in backwards

1 of 1 people found this helpful.
2,985

two bolts easy check

1 of 1 people found this helpful.
2,985

is there a shroud with the radiator? sometimes that is needed to get the air going thru radiator to help it cool

1 of 1 people found this helpful.
345

did u put the thermostat in assbackwards?? i know its a simple task but that can cause it to overheat

2,985

last but not least i have had great luck with aluminum radiators, and some friends use electric fans

did it over heat before you had the work done ? are you using a 4 core radiator? you might need a high flow water pump . a shrowd is also a big help. in fact i need one for my car .

1 of 1 people found this helpful.

could be an air pocket ,let warm up with the cap off ,when the thermostat opens it will either start flowing or in will drop down real fast. if it does ,that was the air pocket filling up. just add more anti freeze and put the cap on .

2 of 2 people found this helpful.

Your Answer

Add photo

Related Questions

  • Overheating 10 answers

    My 1964, 389 pontiac motor thats been bored out to a 410 has a very bad overheating problem. All the obvious has been replaced; including the water-pump, thermostat, radiator and the hoses. It appea...

    1969 Pontiac Firebird

    -

    Maintenance & Repair

  • overheating and accelleration problems 3 answers

    hey i had a overheating problem so i put in a new thermostat and it ran cool for a day then it got really hot like water spoutting out the breather so i bought a new radiator now it runs hot when i dr...

    1997 Pontiac Firebird Trans Am

    -

    Maintenance & Repair

  • Engine Overheating FYI 2 answers

    It absolutely amazes me how many people are having problems with overheating and yet nobody suggestes changing the radiator cap. If the radiator cap is not functioning properly it allows pressure to b...

    1987 Pontiac Firebird

    -

    Maintenance & Repair

  • Losing coolant/ no leaks 2 answers

    Repair overheating

    1995 Pontiac Firebird Base

    -

    Maintenance & Repair

  • Keeps overheating unless under 2000RPMs 6 answers

    My 2002 V6 Firebird keeps over heating. Im knocking out parts one at a time. Just replaced the radiator cap and about to change the thermostat. I noticed that there is Rust around the radiator and a g...

    2002 Pontiac Firebird

    -

    Maintenance & Repair

Firebird

Looking for a Used Firebird in your area?

CarGurus has 764 nationwide Firebird listings starting at $2,995.

ZIP:

Search Pontiac Firebird Questions

Pontiac Firebird Experts

#1 Samuel Moore
Samuel Moore
Reputation 960
#2 dandyoun
dandyoun
Reputation 810
#3 John Saffrahn
John Saffrahn
Reputation 700
View All

Related Models For Sale

Used Chevrolet Camaro
372 Great Deals out of 31,228 listings starting at $2,500
Used Ford Mustang
682 Great Deals out of 44,482 listings starting at $1,500
Used Chevrolet Corvette
218 Great Deals out of 22,160 listings starting at $3,750
Used Pontiac GTO
6 Great Deals out of 470 listings starting at $6,995
Used Dodge Challenger
256 Great Deals out of 22,333 listings starting at $7,995
Used Dodge Charger
535 Great Deals out of 28,458 listings starting at $2,500
Used Pontiac Grand Prix
25 Great Deals out of 2,827 listings starting at $1,850
Used Chevrolet Impala
548 Great Deals out of 35,509 listings starting at $899
Used Chevrolet Monte Carlo
12 Great Deals out of 1,433 listings starting at $2,400

Used Cars For Sale

2002 Pontiac Firebird For Sale
11 Great Deals out of 127 listings starting at $3,990
2001 Pontiac Firebird For Sale
65 listings starting at $8,588
2000 Pontiac Firebird For Sale
60 listings starting at $6,999
1999 Pontiac Firebird For Sale
65 listings starting at $8,995
1998 Pontiac Firebird For Sale
36 listings starting at $7,788

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.