You can remove both inlet and outlet heater hoses from engine put a garden hose to either end to make sure it is flowing properly, they do have small ports so it is easy to clog. A few more things to check, always use a thermostat, make sure all air is removed from system there should be bleed valves on the highest point of the cooling system. And lastly check water pump for good flow.
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The lack of heat in the car has little to do with the car's cooling system, other than the hot coolant is the heat source. 95% of all "no-heat" issues are related to heater controls and/or the heater core itself. Since you get some heat, and then it goes away, this indicates a probable vacuum leak in the heater controls. When you select heat, vacuum is directed to a vacuum motor. This motor operates a vacuum actuator that moves a linkage that moves a door inside the heater box to direct the interior air through the heater core. If this actuator has a leak, it will activate, then as the vacuum leaks off, deactivate. You probably need to have a part replaced in the heater actuator mechanism.
Yup, flush the coolant ayatemavoid using Barsaleak type leak treatments for leaks. They are notorious for clogging up.heater. cores.
a fresh air actuator door can also get stuck open allowing cold fresh air which in wintertime feels like no hot air at all. I think this door is actuated by vacuum hose.
Depending on the history of the vehicle, it could be in your climate control not actually switching to heat, could be a clogged heater core if it ever had a leak and some sort of stop leak additive was used to fix it(hate that stuff) or there could be air in your cooling system...just some things to check!!
There is a switch on the control console that
activates the heater door control. The door control is located behind
the glove box. (You have to remove the glove box to get to it) If the
switch on the console is bad, or the door control is bad, the door may
not be opening to allow the blower to blow through the heater core and
into the cab. I would think that if the core were plugged or coolant
wasn't allowed through it, it would cause the car to overheat. its called a blend door it turns different ways door can stick causeing no heat
1. coolant leak (level too low to fill heater core)
2. headgasket leak forcing the coolant out of the overflow.
3. stuck thermostat.
4. bad water pump. if the impelers are broken, coolant wont flow.
5. HVAC malfunction. system may think you selected cold or is unable to move diverter. maybe a fuse,solenoid or vaccum leak? (hvac controler uses vaccume controled soleniods)
6. airlock. if you have resently changed your coolant, you may need to repeatedly squeeze the heater core hose to help force out the air.
a heater uses the temperature of the cars water, running threw a heat exchanger if the heater core has failed water will not circulate threw the engine properly this will and can cause over heating as well as nothing blowing from the heater. good luck.heater cores are generally inexpensive parts to replace.
last thing you can check if heater core is ok. is the thermostat.
If it had dexcool orange coolant in it, the heater core is probably plugged, pull off the hoses and blow air through it, the dexcool breaks down and clogs everything. I had this problem a month ago and the core was plugged badly. Hope this helps
There are a few things that can cause this problem. Reason #1 a low coolant level can cause the heater core to receive less coolant flow hence causing the heat to come less quickly. reason #2 sticky heater control valve, if this control valve is stuck closed coolant cant enter the heater core hense wont heat up the cabin, reason #3 clogged heater core, over time some heater cores will clog up even sometimes start to leak in cabin. All these are normal circumstances and should be checked. Good luck