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Discussion Starter · #1 ·
My 2016 with 88k has no heat, not even slightly warm air. I looked at other threads about the same issue and thought the heater control valve may be the culprit so I pulled the fender liner tonight. The valve looked fine but with the car at operating temp there was no coolant going to or from the valve.
There are no visible coolant leaks, no overheating issues, and the coolant reservoir is at the bottom line when hot.
My next step was going to be topping of coolant and seeing if I can get any air bubbles out and if that doesn't yield results maybe flushing the system. Any input would be appreciated!
 

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Discussion Starter · #3 ·
I saw that thread but I thought I misread it. I assumed a blockage at the valve wouldn't affect the coolant flow from the engine but maybe it formed some sort of air pocket?
That's good to know about the vacuum tool to flush, I don't have shop air so I might take it to a shop to do that first.
The car is new to me and the coolant looks fine but I doubt was done every 2 years.
 

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Discussion Starter · #15 ·
So the issue is solved. After the dealer flushed the coolant I had them diagnose it. They came back and said it was the heater control valve. I was quoted just over $1000. So of course I declined that and ate the $140 diagnostic fee. I ordered the part through another dealer for around $150 and got around to installing it tonight. I was pretty worried about dumping coolant everywhere even though it didnt seem like coolant was flowing to the valve. I took off the engine side first and quickly connected to the new valve then heater core side. I probably lost about 3-4oz of coolant in total. I buttoned it back up and the heat works great. My tiny little brain still doesn't understand why a bad valve would cause the hose that goes TO the valve to not heat up. It's an easy job and paying the diag fee to the stealership made me confident that I wasn't just throwing parts that the problem. Thanks to everyone for your input and help!
 

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Discussion Starter · #19 ·
Yes , that's the one.
You were right! I must be picturing it wrong but I was thinking that coolant would be flowing from the motor and stop at the valve when its closed but the valve must send a signal to something else upstream in the coolant system that allows coolant to flow. If I get bored this weekend I'm going to do an autopsy on the old valve to see if I can find out what the issue was.
 
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