Coolant Temps Bouncing all over - Page 2 - Chevy HHR Network


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Old 07-11-2018, 03:41 PM   #11  
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Could be the pump or clogged radiator. I am leaning toward bad pump.
Have the HHR had issues with the pump at high mileage? Like the impeller slipping?
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Old 07-11-2018, 06:25 PM   #12  
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Not necessarily at high mileage, but impellers have been known to stop spinning for various reasons. Chain, bearing, impeller etc. The weep hole being on top in a hole doesn't help you noticing a bad bearing, like you used to be able to do. Plus the impeller is just a force fit onto the shaft.
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Old 07-11-2018, 10:04 PM   #13  
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Really, hmm. Mine does the same thing, but only on hot days and after driving it hard up a long hill.

I changed the coolant and thermostat and it stays 178-190 all the time except on really hot days where it does what this person is experiencing.

I know I did not add enough water to my coolant mix so I will be replacing it again soon.

If it was the pump would’t It fail to go back down in temperature at a stop?
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Old 07-11-2018, 10:07 PM   #14  
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Oh, I see. He said it rises when he is not moving.

Does it rise when you are not moving after you drove it hard? Or just all the time like in slow traffic?
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Old 07-11-2018, 11:18 PM   #15  
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Mostly just in stopped or stop & go traffic. I ordered a new radiator and thermostat and will change out the fluid. I need to get this corrected since this is my work car that I drive all day.
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Old 07-11-2018, 11:45 PM   #16  
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ah, well hopefully the new radiator, thermostat and coolant cures your problem.

Otherwise I would have to agree with them, the water pump may be failing.

Best of luck! :)

Tip: use premixed 50/50.
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Old 07-11-2018, 11:51 PM   #17  
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Not to steal the thread but, does anyone make a full aluminum performance radiator for the HHR?
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Old 07-12-2018, 05:42 AM   #18  
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Mostly just in stopped or stop & go traffic. I ordered a new radiator and thermostat and will change out the fluid. I need to get this corrected since this is my work car that I drive all day.
Don't use anything but the proper AC-Delco thermostat and Dexcool... You don't want to have to do this twice.
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Old 07-12-2018, 08:41 AM   #19  
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I have a Delco radiator and thermostat on order. I will probably just buy the pre-mix. What is the total capacity for coolant>
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Old 07-12-2018, 10:14 AM   #20  
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Premix Dexcool, I buy two, one gallon jugs, leaves a bit for burping the system and top ups if required
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