It is the K-10 heater module. Seems odd it would work sometimes and not others. If you see a kw draw on the power screen when requesting heat, then the module is drawing current and working. It's a bitch to change and you have to disable the HV system as it's fed by 300v from the battery pack. You also have to remove the engine intake manifold to get at it, mounted on the firewall. Actually your problem sounds more to me like the switching valve which has also had some problems. Or possibly the coolant pump. Replacing any of those 3 things also requires draining and refilling the engine cooling system, which is done with a vacuum filling device. The coolant pump for heater is located on lower right side inboard of right front wheel, mounted to frame rail. When electric heat is on, you should be able to put your hand on it and feel if its pumping. Unfortunately servicing the HVAC system is not a do-it-yourself project. Do you have heat when the engine is running? I also would agree your clicking sounds like axle nuts, not brake caliper pins. The caliper pins have boots that seal in the grease and keep out moisture and dirt.
No heat in 2013 on EV
So I took my 13 to the dealer for the axle click noise and no heat most of the time I'm on electric.
They said my caliper slides need to be lubricated to fix the axle click noise. They want $70 an axle and want to do both axles. And they want to reprogram the HVAC module for $218 plus a $109 diagnosis fee. I told them I'll pass on everything.
After the car sits at night I have heat. If I stop somewhere and shut the car off then back on again within a few hours I won't have heat the 2nd time. If the car sits 5-6 hours the second time, I'll have heat.
They are reprogramming the charger module under voltec warranty as there was a code for it.
The SW actually told me the engine NEEDS to run to produce heat as the car needs to be in open loop to make heat. So basically he doesn't have a clue. And this is the dealership with the volt specialist in the area.
kWh jumps up as if the heater is drawing power but no heat.
They said my caliper slides need to be lubricated to fix the axle click noise. They want $70 an axle and want to do both axles. And they want to reprogram the HVAC module for $218 plus a $109 diagnosis fee. I told them I'll pass on everything.
After the car sits at night I have heat. If I stop somewhere and shut the car off then back on again within a few hours I won't have heat the 2nd time. If the car sits 5-6 hours the second time, I'll have heat.
They are reprogramming the charger module under voltec warranty as there was a code for it.
The SW actually told me the engine NEEDS to run to produce heat as the car needs to be in open loop to make heat. So basically he doesn't have a clue. And this is the dealership with the volt specialist in the area.
kWh jumps up as if the heater is drawing power but no heat.
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