Question about 1998 Ford Ranger

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98 ford ranger no heat have changed thermostat water pump heater control valve

Engine heats up to normal operating temp set heater to control positions still no heat

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Maybe the heater core is plugged or you haven't bled it properly?
If the heater hose returning from the core to the water pump is NOT hot, while the hose going to the heater core from the thermostat area IS hot, then the heater core is plugged probably.
You need to remove the heater hose while cool,from the thermostat area and remove the hose from the water pump area (that's the outlet of the flow thru heater core) AND THEN take a garden hose with p-is-tol grip type sprayer,and blow water back thru the outlet hose out the inlet hose. This will blow any bad plugging material out the way it got in.
Don't apply too much pressure if it is plugged bad. The heater core isn't made to stand 50lbs. water pressure. don-ohio (:^)

Posted on Dec 31, 2016

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Could be problem with temp door? Do the heater hoses get hot? Does the engine reach normal operating temp? if not, check your thermostat. Can you check coolant flow through heater core? All I can do is list some possibilities.

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I have a 1991 Ford Ranger 2.9,and I am having a heat problem I did change the thermostat but no heat yet,this is what I found so far. I checked top radiator and its hot,the bottom hose on radiator is cold....


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My cars interior is not being heated. I was tod that it was the waterpump, could it be the theremostat. The car is a 02 Intrepid 3.5L engine.


Okay, The water pump is more than likely okay but at this point I would not rule it out completely. One simple check to see if the water pump is moving water and that the thermostat is opening and closing is to take off the radiator cap when the car is cold. Start the car and stand at a point where you can see down in the neck of the radiator without looking straight down into it. When the thermostat opens you will see the coolant level change dramatically when the thermostat opens, you should be able to see the coolant being pumped through the coolant tubes in the radiator. IF you see the coolant level change and then see the coolant being pushed through the coolant tubes, then the water pump and thermostat are probably okay. If they appear to be working okay then the next thing is to check the heater hoses to see if they get warm. Do not grab either one while the car is at normal temp as they can be very hot. Let the car cool down for about a half an hour then see if they are both warm. If they are, then I would move to the inside of the car and check the heater controls. There may be a malfunction in them. The reason for this logic is that if the water pump is not operating properly or the thermostat is not functioning properly, Chrysler will usually turn on the check engine light indicating a problem. They have sensors in the engine that tell if the coolant is to cold or to hot (these are not 100% accurate but in most cases are). The heater controls on the other hand are not tied into the check engine light so if there is a problem there, you will have to do some digging to find the problem. If the heater one of the heater hoses is cold and the other is warm after running the engine then the heater core is probably plugged up not allowing the hot water to move through the core to produce heat.

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No heat in cab in ford ranger 2005 tied heater


check if both heater hoses going into firewall are hot.. if only one is hot then your heater core is stopped up..you can take both lines loose and take a water hose and back flush,,, force hose on one inlet of heater core for a minute and then the other.. keep going to you get a good flow...make sure heater valve is open, not just valve position take loose and confirm clear..last make sure your thermostat is not stuck open keeping engine from comming up to temperature

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the temp blend door may not be rotating from the a/c evaporator to the heater core opening.

Could be the motor on the blend door or the temp control knob.

Do you have manual a/c or electronic temp control?

If it's the a/c door electronic actuator motor, it's on top of the plenum. Have to remove the instrument panel for access.

Hope it's the temp knob on the control head.

top one is the circuit you are looking at
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hello.....
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hi this sounds like the elec operated coolant control valve has failed? common fault on ford models however to confirm this? if you warm engine to normal then turn temp setting to full hot do not put fan on yet! locate the heater hoses from engine to point they go into bulkhead of engine bay? feel each hose for heat ? if one is warm/hot and other much cooler/cold ? then cooler valve is not opening so coolant can flow thro heater matrix inside car understand?? unfortunate;y this valve is not servicable but is easy to change and not too expensive ? its location is normally at point prior to entering car interior and you will find it if you follow heater hoses? it may well be in bay below the grill below w/screen is normally plastic renewal will be apparent when you see it ? hope this helps ? just one point all above is on assumption you have checked radiator coolant level is topped up ?? if not this will also give no heat thro heater ? if very low

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