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Username Post: Running too warm        (Topic#361051)
rls8836 
Member
Posts: 387

Loc: North La.
Reg: 01-30-02
05-20-20 04:26 PM - Post#2794311    

My 55 has a 1974 350 engine, stock two barrel carburetor. Seldom drive it, but every time I do, the temp. Gauge will slowly come up and go to about 230, then suddenly go down to 180 then back up to 230 then back down to 180. Does this usually twice. After it stops that fluctuation it will stay right at 180 unless I



 


57tim 
Valued Contributor
Posts: 3074
57tim
Loc: Cameron, Wi, USA
Reg: 11-09-01
05-20-20 06:10 PM - Post#2794323    
    In response to rls8836

Cheapest and easiest is a new thermostat.

57 Bel Air 2dr Ht
327 700r4
http://www.picturetrail.com/tmneid


 
rls8836 
Member
Posts: 387

Loc: North La.
Reg: 01-30-02
05-20-20 06:59 PM - Post#2794326    
    In response to 57tim

57tim, that is correct. I



 
acardon 
Ultra Senior Member
Posts: 11379
acardon
Loc: DFW TEXAS
Reg: 03-25-05
05-20-20 06:59 PM - Post#2794327    
    In response to rls8836

Fluctuations like that are usually caused by air in the coolant. Idle the engine with the cap off and the front end as high as you can jack it.
If it's getting hot at highway speed, it could be a clogged radiator. You should have plenty of air flow at highway speed.

Don
66 Corvair (driving)
57 2dr HT (driving)
56 2dr HT (waiting to be restored)


 
rls8836 
Member
Posts: 387

Loc: North La.
Reg: 01-30-02
05-20-20 07:14 PM - Post#2794329    
    In response to acardon

You know I



 
rls8836 
Member
Posts: 387

Loc: North La.
Reg: 01-30-02
05-20-20 07:20 PM - Post#2794330    
    In response to rls8836

I



 
Rick_L 
Member #409
Posts: 27733
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
05-21-20 10:03 AM - Post#2794390    
    In response to acardon

As acardon said, the temperature fluctuation when warming up like that is often an air bubble.

Increasing temperature with increasing speed is a separate problem that certainly could be a clogged radiator. Thing is, a thermostat that doesn't open fully can do that too.

So I would put a new thermostat in it as 57tim suggested.



 
rls8836 
Member
Posts: 387

Loc: North La.
Reg: 01-30-02
05-21-20 06:53 PM - Post#2794426    
    In response to Rick_L

Thanks for the reply



 
wagonman100 
Super Senior Member
Posts: 14551
wagonman100
Loc: Baltimore, MD
Reg: 11-27-04
05-22-20 09:02 PM - Post#2794520    
    In response to rls8836

Try the thermostat first. Going up that high and then a severe temperature drop indicates it may be sticking. You can hook up a 6 cylinder radiator to a V8. I

Jay
Friends don’t let friends drive Fords.

1999 Silverado Z71 4X4 extra-cab short bed
1983 Malibu Fauxmad - tubbed
1978 El Camino Kustomized
1972 Monte Carlo
1957 210 handyman wagon
1957 Nomad sport wagon
1957 Cameo Carrier


 
bobb 
Super Senior Member
Posts: 5630

Loc: paradise
Reg: 09-05-03
05-23-20 09:19 PM - Post#2794596    
    In response to rls8836

i would put a new thermostat in it. preferably oem. when a cold engine gets up to stat opening temp the hot coolant will go into the radiator. the cold coolant will go into the engine and close the stat. this will go through a few cycles like this until the system gets up to operating temps.

70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails.


 
toms57 
Senior Member
Posts: 529

Loc: Caney, Ks, USA
Reg: 10-28-01
05-24-20 12:24 PM - Post#2794652    
    In response to bobb

If It was me, I would do the thermostat with a small hole in the flange first. If that doesn't work, I would replace the radiator, preferably with Aluminum. I wouldn't spend anything on a radiator that is that old.

Toms57



 
57tim 
Valued Contributor
Posts: 3074
57tim
Loc: Cameron, Wi, USA
Reg: 11-09-01
05-24-20 06:46 PM - Post#2794699    
    In response to toms57

Get a good quality one. I recommend Stant. Beware of cheap ones, they don't last very long.

57 Bel Air 2dr Ht
327 700r4
http://www.picturetrail.com/tmneid


 
Rucco49 
Newbie
Posts: 15

Reg: 07-26-19
06-09-20 10:19 PM - Post#2796046    
    In response to rls8836

Have you tried a new thermostat?



 


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