Question about 1991 Ford F350

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1991 F350 How do flush a rad with no flush valve! What can i do to trouble shoot over heating problem! Chanaged Thermostat, 91 F350

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  • Dunnville Jun 08, 2008

    This becoming a real headache! Can find the over heating problem....Is it possible i put in the wrong thermostat could it be the water pump,Rad,.. Thank-you

  • Dunnville Jun 11, 2008

    1991 Ford F350 5.8 ,351 Dually

    The problem was that the truck would not stop over heating!


    Fan Clutch! It was a easy fix!



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  • 87 Answers

Water pump very possible take off radiator cap run engine do you see flow or is the water bursting out how tight is the upper hose when running at any temp you may have a blown head gasket or clogged catalytic converter

Posted on Jun 08, 2008


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1 Answer

I have (or my kid has) an old 91 firefly with a

yes drain the coolant and then add 200grms of caustic soda and run engine till hot then give a good flush and then remove the heater feed pipes and flush with hose reversing direction a couple of times ,might help but cant guarentee it because the layout of the heater coil is such that the water doesnt pass from one side to the other but the inlet and outlet are both on teh same header tank .But the caustic will help to more some of the clag

Dec 12, 2009 | 1991 Mitsubishi Montero

2 Answers

1994 Honda Civic LX\overheating within 2 mile drive

Remove and raise upper hose at thermostat end and remove lower rad hose.
Fill rad with a hose and watch for flow from bottom rad hose and/ or bottom rad hose connecton.......water should fall though rad easily.
Honda rads are cheap.....any restriction....replace rad.

Remove thermostat....fill thermostat housing with hose and watch for water flow at bottom rad hose.
Flush good.

Remove heater hoses.......flush back and forth until a good flow is present "With heater control set to hot" if no or poor flow....replace heater core.

Stop leak can plug everything.

Also.......not likely causing over heating....but your mileage,if you do not know if the timing belt has been changed.....CHANGE IT NOW!
Water pump is optional at this mileage.

Aug 23, 2009 | 1998 Honda Civic

2 Answers

Overheating in my 1995 Grand Am SE.

you could try that special stuf for your toilet to flush out any debri plug one side of the radiator real thight fill it with the toilet stuf with boiling water follow the instuctions on the bottle its a thought

Jul 30, 2009 | 1995 Pontiac Grand Am

1 Answer

91 nissan maxima se no heat

I'd start by changing the thermostat. Make sure you let it run for quite a while after, when adding coolant back into system, with heater on (not defrost) at least long enough for rad fan to come on 2 or 3 times, before you put cap back on the rad, to make sure all air is bled out of the system, then top up return bottle.

Apr 29, 2009 | 1991 Nissan Maxima

3 Answers

Water is not circulating in radiator. Engine is running hot.

sounds like the thermostat. the thermostat lets the water flow from the block to the top of the radiator.

Mar 20, 2009 | 1992 Nissan NX

1 Answer

No heat 98 gmc pick up just cold air

their is a heat control valve that is by the top of the wheel well it works off vacumme if its not working you wont get heat

Feb 22, 2009 | 1999 Chevrolet Silverado 1500

3 Answers

We have a 1991 ford 350 and it is overheating

Most likely it's a stuck / faulty thermostat.

The two brass fittings are for the automatic transmission fluid cooler.

Some models simply don't use a drain valve.

Jun 08, 2008 | 1991 Ford F350

2 Answers

1991 Ford F 350 Dual rear-end

To willmc8608

If the Therostat housing is mounted on the left front of the engine, unbolt the alternator and it's mounting, then unbolt the vaccum booster pump, this will reveal the mounting bracket to the fuel filter assembly mounting braket, unbolt the supports to the assembly and move to the side. Two bolts hold the therostat inlet ini place.

Jun 08, 2008 | 1991 Ford F350

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