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Is the system full of coolant ? Is the heater control valve opening an allowing coolant to go through the heater core ? Under the hood in engine compartment , on the heater hose , a metal or plastic round canister with vacuum hose hooked to it .You can google heater control valve for 2005 ford explorer to see what it looks like . When you find it ,with engine running pull the vacuum hose off to see it the valve opens an closes ! Feel the hose after the valve , is it hot ?
Yes, it might be hard to find such a diagram. Short of a factory service manual, I don't know. Perhaps a friendly parts person at a Chrysler dealership might be able to provide you a copy of how the vacuum lines connect, and how routed.
What you generally have is a single vacuum line from the engine going into the firewall and under the dash to the rear of the heater/AC control assembly. The line enters a fixture that can distribute vacuum signals through several hoses. One of those is the hose to the water valve, the only vacuum line that goes back into the engine bay. Selecting heat on the control obviously will send vacuum from the fixture to the water valve. The other hoses or lines connect to diaphragm operated door levers to control where air is sent.
See where the vacuum line for the valve goes back into the firewall. Then get on the inside and try to find that line-it may have broken or come apart. You may need to pull the heater control assembly out to get to the podlike fixture that the vacuum lines sprout from.
An alternative in this frigid weather, a make-do temporary fix, is to tee off a manifold vacuum line from the engine, and run a hose to the water valve. It will be on constantly, but it's winter, hey?
You will need a Vacuum hose diagram to hook thes up correctly. There should be a diagram on the hood or raiator cover of the vehicle. If the diagram is missing you will have to take ALL info from your car (Year,Make, Model, Engine size, Engine code) and obtain the diagram from a dealer.
Both heater hoses should be HOT to the touch (coolant return hose should be slightly cooler than the supply hose). Now, first thing to do is to see if you have vacuum at the heater control valve when the lever is in the HOT position. If there is no vacuum, then you have a problem with the heater control panel or vacuum supply.
If you do have vacuum, then it's probably a bad heater control valve. If you supply vacuum from a hand vacuum pump and there is no change in hose temperatures, then the heater control valve is bad. You can take it out and look inside to see if it opens and closes.
If the heater control valve is fine, then you probably have a clogged heater core. The construction of a heater core is such that if it is 95% clogged, water will still pass through the remaining 5% and come out clean.
If everything checks out fine, then you have to look inside the heating vents for an obstruction.Thanks
Check the vacuum diaphragm in the heater hose. It's a little metal valve with a hose going to it. When the heat is turned on the vacuum line opens the valve letting hot water pass through the heater core.
Warm up the truck touch both heater hoses about midway in the hose . If one is hot the other cold you have no waterflow through the heater core. check the heater control valve it will be a valve in one of the heater hoses. usually cable or vacuum operated. make sure that valve is opening. if not, manually open it may be necessary to tie open to see if you have heat and if you get heat. If you do get heat determine wheather you need a new (control valve or cable or vacuum hoses. If you still have no heat chek the blend air door inside under the dash this is the door that changes the airflow direction from AC to heat it may not be working properly. Hope this helps.
The heater bypass valve is bad.It's located on the heater hose under the hood near the firewall.It looks like a little 3in.diameter black disc with a vacuum line attatched to it
See if you can find the heater control valve. It will either have a cable or a vacuum hose. if it has a cable and you can close the valve manually than it is a problem with control head in the dash, if not replace the valve. if it's a hose then check for vacuum at the hose with heat in the off position. If no vacuum and valve is still open then replace the valve. if vacuum is present problem is in the control head in the dash. hope this helps.
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