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if no air in the system from internal heater or other places
new thermostat and radiator cap
good firm coolant hoses
old school air bleed you fill coolant system with motor running
heater on in the car and thermostat open burp the hoses until bubbles are no more
if still no better
what about these possibles
faulty coolant temp sender
head gasket failed
clogged radiator
cooling fans not spinning fast enough
or not coming on soon enough
You mean the car is running fine but just No Heat? If so -Sound like the heater hoses are plug. or the control valve is no function
-Check the heater control valve and flush the heater unit with water of garden hose from both directions. Q: How do I know that is working or not? A: Slide the heater control from Hot to cold or cold to hot and check it turn or not. (If not turn at all. The cable is broken or slip off)
If it where your water pump isthe vehicle would overheat.
After you replaced the thermostat do you run the engine at idle with the radiator cap removed until the radiator fan came one?
This will help push the air out of the system.
There are two other possibilities.
1. The heater core is plugged. Back flushing the heater core may help remove the built up debris and get you heat again.
2. The blend door may not be fully transitioning from cold to hot. You should be ale to hear a district change in how the air sounds when switching from full hot to full cold.
Let me know if you have any questions and I'll do my best to answer them. Thank you for using FixYa.com!
I would try flushing heater core to see if it's plugged. I don't think it's waterpump, your rig would be overheating if it was. Leaking is most common waterpump failure.
Thermostats are a necessary element and they allow hot coolant into your heater core. I would replace it with a dealer supplied one.
You will ruin your engine if you operate without it.
If this doesn't work have the system flushed as a last resort. Pay a little more to have a dealer do it. Well worth it.
They will also check your rad cooling ability as well ad your heater core.
Sounds like you may have a partially plugged heater core. You could flush this out separately, from flushing radiator & engine block. Diconnect heater hoses going to your heater core and clamp off, so not to loose coolant from engine. Now hook up separate hose to one side of heater core pipe and flush out with typical garden hose. Repeat procedure on both heater core inlets. Reconnect original heater hoses and test difference. You may have to add an additional litre of antifreeze. If this don't work i suggest changing heater core. Good luck.........Ron.
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