I have a 1993 ford ranger XLT 3.2v and c@ant get the heat
to work. I've installed new thermostat , new heater core and cleaned out the duct work/ tubing
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If the engine seems to heat normal with the interior heat lagging, there is a flow problem for the hot water. If the engine stays cold a long time, its the thermostat. Interior heaters work several ways. Some adjust the air ducts across the heater core. Others adjust the water flow to the heater core without the ducts doing much. A third type do both.
The activation devices can be simple mechanical cable, electric, or vacuum powered. These control water flow or duct air routing. There are some videos if you search the Web for your year and make of car. Even thermostat replacement is shown.
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 (:^)
the thermostat is the easyest place to start with but im betting on a pluged heater core your gonna have to back flush the heater core take off the hoses to the heater and some how connect a garden hose then slowly turn the water on watch and observe anything coming out.
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
If no coolant flowing through the heater core then ther is no heat. There are 2 possible root causes needed to check out:
1- THE VALVE TO CONTROL THE COOLANT FLOWING TO THE HEATER CORE IS NOT OPENING AS DESIRED.
2- THE HEATER CORE GOT CLOGGED UP AND NEED TO BE FLUSHED.
Is the blower blowing? if not could be a blown fuse or bad blower. If the blower is working make sure your coolant level is full, If both of theese things check out , you may have a vacume line loose somewhere that controls the duct witch controls it to change to defrost ,vent or hot to cold.
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