1966 Mustang Heating Problem Help!

bpage4110

New Member
Nov 11, 2015
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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!
 
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tos

SN Certified Technician
Apr 27, 2001
882
66
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
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0
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76
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
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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
56
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
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0
1
71
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
71
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
56
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.