Question about 1966 Ford Mustang

2 Answers

1966 Ford Mustang overheating

6 cylinder, standard trans., I have flushed the cooling system, replaced thermostat, new radiator cap, checked fan and belt but it still over heats intermittently. Can drive today and no problem, drive later short distance and over heats. No engine miss. No external coolant leaks visible, no water in oil. Could it be water pump ? Pump not noisy or leaking.
Suggestions please.

Posted by on

  • 1 more comment 
  • bass_man63 Dec 02, 2008

    Coolant mix 50 % water, 50 % antifreeze

  • elandsverk Feb 05, 2009

    I have the same problem on a 1966 289V8. I replaced the radiator, waterpump, hoses, no thermostat and it still overheats. Could it be the head gasket? I need help.

  • Anonymous Mar 23, 2014

    Water pump leaking



2 Answers

  • Level 1:

    An expert who has achieved level 1.


    An expert that got 5 achievements.


    Visited the website for 3 consecutive days.


    An expert who has answered 20 questions.

  • Contributor
  • 39 Answers

If you run the car with the cap off the radiator once the thermostat opens you should be able to see the water flow past the filler neckthat will tell you if the water pump is pumping but if it has an intermittant problem i would lean towards the thermostat may be sticking they only cost a few dollars so i would replace that first then go to a dealer or radiator shop and ask them to pressure test the system this will identify any pressure loss

Posted on Dec 26, 2008

  • Level 1:

    An expert who has achieved level 1.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 5 Answers

Try to run the water pump without hoses, and add water in the 'in' side, if is powers out the other side, then it's fine. how is your water/coolant mix?

Posted on Dec 01, 2008


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Does ford 3.8 v 6 temp sensore thread into water jacket?

maybe air in the system? park it on ramps or a good uphill slant and remove the radiator cap and let it burp while you refill the radiator with coolant

Oct 02, 2017 | Cars & Trucks

1 Answer

67 mustang 200 cu that runs hot @ 220 plus

I had a 70 stang that ran hot. It had cracks in the block between the water jackets and the cylinder. It was blowing hot gas right into the water...

Jul 03, 2012 | 1966 Ford Mustang

1 Answer

Symptoms of a cracked head

First of all, don't "disable" the thermostat, It is an important part of the cooling system. Without it, you could crack the cylinder head from coolant boil-over! Ok, the most obvious sign of a cracked/warped head, or gasket failure is white smoke at the tail pipe, air bubbles in the cooling resivoir, milky, thick, coffee with cream colored oil, or external coolant leaks. If you just have an overheating problem, you should investigate the cooling system first. Check the fan(s), there may be a belt driven and an electric fan for your truck, make sure they both are operating. (turn the ac on with the engine warmed up) Check that when at operating temperature, shut the engine off and make sure the belt driven fan has resistance when you turn it by hand. If it turns and spins freely, replace it. Flush your radiator with a good coolant flush chemical and follow the directions. When flushing, look for water flow in the radiator cap. Replace that thermostat with a new one! replace the coolant cap also. Check for debris on the radiator fins like leaves, plastic bags, mud and bugs.

Feb 22, 2012 | 2003 Jeep Grand Cherokee

1 Answer

93 4runner new radiator new t stat still overheating.


1. Thermostat. Replace with an OEM one from the dealer. 2. Radiator. Make sure it's not plugged up. 3. Radiator Cap. There cheap from the dealer and I consider them a maint. item. 4. Water pump. How many miles are on it? 5. Fan Clutch. Make sure it has some resistance
6. Temp. Sensor for the gage.Have you checked that the electric cooling fan is turning on when the engine reaches operating temp? A faulty coolant temperature sensor will not trigger the fan, or the fan itself or fan relay could be shot. You might also have a head gasket leak that is not into the cylinders, so it would overheat without causing milky oil. Another possibility is a clogged radiator -- with 15 years on the vehicle, it's quite possible. Have the cooling system pressure checked, and replace the radiator cap for starters -- if the radiator cap isn't holding pressure, overheating will occur rapidly.

Oct 17, 2011 | 1993 Toyota 4Runner

3 Answers

I have a 1994 ford F-150 , 5- speed, 6 cylinder, Engine size 300. I have to pull over to the side of the road and turn the engine off because its overheating in stop and go traffic

If it only is overheating when going slow, then one of three problems exist; One, there is not enough coolant in the engine. Check the level of anti-freeze in the truck, and top off as neccessary.
the coolant is not circulating through the radiator and engine properly. Check the Thermostat, and replace as neccessary. The Thermostat should be changed every couple of years or so, anyway.
the air flow over the radiator is impeded somehow. Does this truck have a elcrtic Radiator fan? Or is it mechanical, being ran off the motor with a belt? If it is electric, then check the fans RELAY to see that it is working properly, and check the fan motor too. Check that there is no debris in the radiator fins.

Hope this helps.

Jun 11, 2011 | Ford F-150 Cars & Trucks

1 Answer

Engine Cooling problem 999 Ford Taurus 6 cyl

have u bled the cooling system ?warm the car and cut the car off right before the fans come on ,let sit for 30-35 minutes,see if the coolant drops in res. if so repeat process untill coolant stops droping ,then drive car regularly if overheating stops ,but monitor it because it will drop somemore/there has been reports of new and rebuilt water pumps nt having correct propelar mounted on them/ backwards etc. if this helps let me know

Jun 29, 2009 | 1999 Ford Taurus

5 Answers

Over heating

have you checked the heater core try bypassing it .

Sep 19, 2008 | 1966 Ford Mustang

1 Answer

1990 Ford Mustang GT Still Running Hot!

check to see if you can spin the fanwhile the engine is cool it should spin freely,if it doesnt fan clutch,also I would switch the fan back to oringinal just to test if this is the problem,if it is youll have to design a different fan shroud if you want to use you new fan,if everything done above is ok with the engine cool take off the radiator cap and squeeze the bottom hose 4-5 times in burst this will make sure you dont have air in the system,if this is helpfull please vote me a fix ya

Jul 15, 2008 | 1990 Ford Mustang

Not finding what you are looking for?
Cars & Trucks Logo

1,265 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts


Level 3 Expert

81400 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

gerry bissi

Level 3 Expert

4376 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides