1966 Mustang Heating Problem Help!

bpage4110

New Member
Nov 11, 2015
4
0
1
36
Ok so I have a 1966 mustang 289 with 302 heads automatic no a/c its over heating when I sit still for a few minutes is there anything I can do to fix this asap? I live in myrtle beach and mustang week is coming up and I know I will be doing a lot of sitting still in traffic.

Thanks!
 
  • Sponsors(?)


tos

SN Certified Technician
Apr 27, 2001
896
68
59
Cincinnati Ohio
The best thing is to find out why its overheating. You might try flushing the radiator with a radiator flush kit first or have a radiator shop clean it for you. Maybe remove or replace your thermostat (could be sticking). Make sure its tuned up properely. If it starts overheating you could turn your heater on with fan on high - this helps cool because your heater core is just a small radiator but located under your dash. This will make it uncomfortable for you from the heat but will save your engine.
Last you could upgrade to a aluminum radiator with electric fan.
 

central_texan

Member
Apr 8, 2016
24
0
13
77
Fredericksburg, Yexas
I had a similar problem with a '66 6 cylinder. Running down the road it was fine. Stop for a few minutes and it overheated. Tried almost everything. Removed thermostat, installed 7 bladed fan, built and installed a fan shroud, checked timing chain, and rodded out the 3-row radiator but no joy. I thought that the engine might be scaled in the water jacket and restricting coolant flow. So I took another engine I had and disassembled it completely, removed expansion plugs and cleaned the water jacket with a hacksaw blade. NO scaling remained. Did a complete overhaul and reassembled the engine. Installed it and overheating continued. Finally broke sown and installed an aluminum radiator and since I removed the thermostat, it will barely get the temp gauge into the normal range now. I think I found the radiator on EBay for around $110.
 

Baja Traveler

New Member
Jun 9, 2016
5
0
1
59
My 64 1/2 289 used to overheat all the time. I put a fan shroud on it and I have not had a problem since. Everything else remained the same.
 

65Ccoderagtop

Member
Dec 27, 2015
30
2
18
57
Maryland
I put in a 3 core radiator from eBay and a 160 degree thermostat. No issues in any parade for the last 7 years. I'm all stock with no heat producing upgrades.
 

66must

New Member
Jul 18, 2016
4
0
1
72
The best thing is to find out why its overheating. You might try flushing the radiator with a radiator flush kit first or have a radiator shop clean it for you. Maybe remove or replace your thermostat (could be sticking). Make sure its tuned up properely. If it starts overheating you could turn your heater on with fan on high - this helps cool because your heater core is just a small radiator but located under your dash. This will make it uncomfortable for you from the heat but will save your engine.
Last you could upgrade to a aluminum radiator with electric fan.
if your radiator works good you should have a difference of at least 10 degrees cooler on the bottom hose than on the upper hose.
 

66must

New Member
Jul 18, 2016
4
0
1
72
I put in a 3 core radiator from eBay and a 160 degree thermostat. No issues in any parade for the last 7 years. I'm all stock with no heat producing upgrades.
How far is your fan from the rad? Should be no more than 1 inche and a fan shroud could help
 

65Ccoderagtop

Member
Dec 27, 2015
30
2
18
57
Maryland
Its close for sure. I have not needed the shroud put back on. I still have it. Just need to shim it out and get longer hardware for the thicker radiator.
 
Thread starter Similar threads Forum Replies Date
H over heating on 1966 mustang Classic Mustang Specific Tech 10
R 1966 mustang engine swap Classic Mustang Specific Tech 2
R 1998 v-6 engine in a 1966 mustang does anyone know if this has been done 1965 - 1973 Classic Mustangs -General/Talk- 15
R 1966 Mustang Coupe Wiring 1965 - 1973 Classic Mustangs -General/Talk- 2
R 1966 Mustang Brake Issues 1965 - 1973 Classic Mustangs -General/Talk- 9
R 1966 Coupe Radio Wiring 1965 - 1973 Classic Mustangs -General/Talk- 0
N Need Help With 1966 Mustang Heater Problem Classic Mustang Specific Tech 8
S Thermal clutch fan recommendations for 1966 Mustang w/ 289 1965 - 1973 Classic Mustangs -General/Talk- 1
6 Biggest rear tire stock height 1966 Mustang??? 1965 - 1973 Classic Mustangs -General/Talk- 0
M Will a Mustang radio made for a 1964 - 1966 Mustang Stereo 1965 - 1973 Classic Mustangs -General/Talk- 7
wicked93gs 1966 Mustang Coupe: Ford 3.7L swap 1965 - 1973 Classic Mustangs -General/Talk- 11
Z building a 1966 mustang straight 6 200ci on a budget Classic Mustang Specific Tech 3
wicked93gs Swapping a 3.7L v6 into my 1966 Mustang, looking for a bit of ECU info 2005 - 2014 Specific V6 Tech 10
S WTB/Trade Need AC unit for 1966 Mustang convertible Interior Exterior Parts 0
B 1966 289 Mustang Overheating 1965 - 1973 Classic Mustangs -General/Talk- 8
W 1966 mustang 289 Balance mystery Classic Mustang Specific Tech 10
N 1966 mustang rear axle 1965 - 1973 Classic Mustangs -General/Talk- 2
R My new 66 mustang 1965 - 1973 Classic Mustangs -General/Talk- 5
K For Sale Translucent Red 1966 Ford Mustang GT350 For Sale! Classic Mustangs For Sale 0
R For Sale Classic 1965GT 1966 Mustang gauges Interior Exterior Parts 0
S 1966 Mustang thermactor filter 1965 - 1973 Classic Mustangs -General/Talk- 4
E mustang 1966 Oil in intake Classic Mustang Specific Tech 7
F 1966 mustang buck tag info 1965 - 1973 Classic Mustangs -General/Talk- 0
A 1966 Mustang Help 1965 - 1973 Classic Mustangs -General/Talk- 1
S 1966 mustang 1965 - 1973 Classic Mustangs -General/Talk- 1
H 1966 Mustang 289 flywheel info needed Classic Mustang Specific Tech 7
A 1966 Mustang - Can anyone tell me what engine this is? 1965 - 1973 Classic Mustangs -General/Talk- 4
D 1966 Mustang 2bbl, 289, C4 disk brake conversion Classic Mustang Specific Tech 3
WadeMcBeth Spindle change between 1966 and 1970 Mustang 1965 - 1973 Classic Mustangs -General/Talk- 5
L 1966 mustang 1965 - 1973 Classic Mustangs -General/Talk- 3
M 1966 Mustang GT Tires and Wheels HELP 1965 - 1973 Classic Mustangs -General/Talk- 2
codecraig Drop-In Engine Suggestions for 66 Coupe 1965 - 1973 Classic Mustangs -General/Talk- 3
MoDriver SOLD 1965-1966 & 1969-1970 Ford Mustang Exterior Door Handle Kit Interior Exterior Parts 0
3ohh2 1966 Mustang Front Wheel Bearing wobble Classic Mustang Specific Tech 6
C 1969 mustang hood The Welcome Wagon 2
M 1966 Mustang Coupe With 302 Engine Classic Mustang Specific Tech 6
D 1966 Mustang 427 Afx Restoration 1965 - 1973 Classic Mustangs -General/Talk- 5
T 1966 Mustang Wheel Tire And Aligment Issue Classic Mustang Specific Tech 2
MoDriver SOLD 1964.5-1966 Ford Mustang Quarter Panels - Original From Ford Parts Dept. (Virginia - 22152) Interior Exterior Parts 0
T Expired 1966 Mustang Gt Project [calif. Bay Area] Classic Mustangs For Sale 0
Tubbster66 SOLD 1966 Mustang Coupe - Fuel Injected Classic Mustangs For Sale 2
J 1966 Mustang Title 1965 - 1973 Classic Mustangs -General/Talk- 4
1 1966 Mustang Rim Fitment 1965 - 1973 Classic Mustangs -General/Talk- 4
MoDriver For Sale 1964-1966 Ford Mustang Coupe Quarter Panels - Original Ford Parts (springfield, Va) Interior Exterior Parts 0
K 1966 Mustang Wheels Classic Mustang Specific Tech 3
D SOLD 1966 Mustang Coupe Classic Mustangs For Sale 1
M Expired 2014 F150 Coyote Engine Other Classifieds 0
S Gps Brake Kits 1965 - 1973 Classic Mustangs -General/Talk- 2
S New Member - Spark Plug Question (289) 1965 - 1973 Classic Mustangs -General/Talk- 5
I Interior and Upholstery 66 Mustang Convertible ¼ Window 1965 - 1973 Classic Mustangs -General/Talk- 3
Similar threads