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Re: 98 ford ranger no heat have changed thermostat water...
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 (:^)
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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.
ok in the engine compartment look at the radiator with the engine cold NOT ON" squeeze the hose with your fingers and feel if hose is crunchy or brittle if is possible a block could have happen locations /points at the vacuum heater valve gate on the heater hoses or a clogged up lower heater hose get a water hose and back flush the heater's hoses normal travel of water is from bottom to top so put the water hose to the tophose and flush backward and try to move the heater valve by finger and see if you get flow (mind you with hoses of the radiator DONT CRANK YOUR 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.
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
Does the coolant temperature gauge show the same level that it always has? If so, it's likely not the thermostat.
A common problem involves the water valve that allows hot coolant to flow into the heater core. This valve is usually located close to the firewall behind the engine. If this valve does not open, you will have no heat. These valves can get corroded, and the cable from the heater control can sometimes come lose. See if the arm on the valve moves when you move the heater control to heat. It should.
first in this problem you need to look for cheapest things to do which is start with you thermostat abd make sure its open and close by how much temp inside the eng. then u need to feel the input hose and the output hose which they come from the heater core they should have closely same temp . if there is non of them have any heat thats mean the water pump blower is broke and u have to replace the water pump, if one of the heater core hose hot and the other cold the problem in the heater core , about the A/C light is on the A/C comprasser shoul work with the heat becuase hot air + cold air = dry air which u need for ur front DEF
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