Question about 1991 Ford F150

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1991 ford f-150 blowing work but no heat change water pump cap flush out heater core next tell me what will work?

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Check and adjust or replace the blend door cable also make sure blend door moves fairly easy

Posted on Sep 01, 2010

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Why does my 1988 ford ranger f-150 over heat


Thermostat is stuck or the radiator or heater core is blocked up.

Apr 27, 2017 | Ford Cars & Trucks

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88 bronco II, heater hose going to water is cold, and my heater blows cold air, is my water pump going bad? the return heater hose is warm, it was heating once in awhile now it don't heat at all just cold...


I would try flushing heater core to see if it's plugged. I don't think it's waterpump, your rig would be overheating if it was. Leaking is most common waterpump failure.

Mar 06, 2011 | 1988 Ford Bronco II

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Heater core problems no heat changed thermostat still no heat any ideas


try flushing cooling system could be a blocked heater core.if flushing doesnt work remove and replace heatercore.

Nov 26, 2010 | 2002 Ford Taurus

1 Answer

F-150 will not heat on heater or defrost. Short time ago replaced heater core. Recently changed thermostat and flushed entire coolant system. Any ideas?????


is the fan blowing if yes unhook the heat core to see if water comes out put a hose up to it to see if water comes out if so it maybe a heater value to

Feb 12, 2010 | 1992 Ford F150 SuperCab

1 Answer

I have a 1991 f-150 4x4. i have replaced the water pump and themostat yet it overheats quickly and blows cold air from the vent when i turn the heat on.


change you rad cap first this will cause the overheating and then go from there as this actually sounds like two seperate problem the other sounds like a plugged heater core

Feb 04, 2010 | 1989 Ford F 150

1 Answer

The heat in my 1992 Jeep Wangler is not working.


The only reason it won't blow hot air is because the water is not getting to the heater core. Check to see if you have a heater control valve in one of the two lines to the heater core. If so check to be sure that is is opening and closing. If it won't open then you get no water flow in to the heater core.

Feb 04, 2009 | 1998 Ford F150 Regular Cab

1 Answer

The heat system is broken


Hi,

You haven't said what is actually wrong with the heat system (there can be several different failures). For the time being I'll assume the fan blows plenty of air but the air is always cool/cold regardless of where the heat temperature selector is positioned.

The most common cause on these cars is a plugged heater core. With the engine at normal operating temperature, feel the heater core hoses (under-hood, mid/lower portion of firewall, access from passengers side). They should both be very warm. If not expect blockage in the heater core.

While a replacement heater core along with a good cooling system flush is the ultimate cure, reverse flushing the heater core will restore heat. This can be accomplished with a garden hose. Disconnect both heater core hoses (not with the engine hot as the coolant get very hot!!) and connect a garden hose. Turn on the water supply to flush the core. Flush the core in both directions (by hooking the hose to one side of the heater core and letting the water run, then disconnecting and connecting to other side of the heater core...). An old garden hose with end cut will work fine if your existing hose will not fit over the pipe (plumb it together anyway you can).

The heater core sits rather low in the cooling system. This means crud in the system will settle there eventually causing blockage. If you flush the core the crud will eventually cause blockage again. Reflushing will work over and over again if saving money is the primary goal.

If this is not the problem, the blend air door is probably not working.

Reply and we'll continue. I don't want to repeat things that have already been done, as $2000 should of covered both things I have mentioned.

Nov 19, 2008 | 1999 Ford Taurus

1 Answer

99 Taurus 3.0 Heater problem


You may need to remove the hoses from the heater core inlet an outlet and flush it directly, I saw these get plugged up on many cars like yours while I was a Ford technician, direct flush of the core cured the issue.

Sep 29, 2008 | 1999 Ford Taurus

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