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Engine Temperature Increase after Water Pump, Thermostat and Coolant replacement

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XC70Rider
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Engine Temperature Increase after Water Pump, Thermostat and Coolant replacement

Post by XC70Rider » Mon Mar 11, 2019 11:31 am

While doing the timing belt last month I also flushed out the coolant and installed a new water pump and thermostat. The coolant was gold so might of been Zerex G05. I flushed all the old coolant out with a garden hose then ran distilled water thru system 4 times to clean out the system.

Here are the new cooling systems parts installed

>Aisin Water Pump 524581
>Volvo Antifreeze 31439821
>Beck Arnley Thermostat 143-0851

She would previously reach only 188F then down to 185F when thermostat opened. After installing new parts she now reaches 192F during acceleration and 202F during bumper-to-bumper city traffic. It only drops down to 188F when aftermarket thermostat opens.

I know water alone will keep it cooler. You presume it's the aftermarket thermostat or maybe getting warmer with a higher % of antifreeze in the system?



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prwood
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Re: Engine Temperature Increase after Water Pump, Thermostat and Coolant replacement

Post by prwood » Mon Mar 11, 2019 11:59 am

The thermostat has a specified opening temperature, and there is often a range of possibilities that fit the same model of car. It may be that you swapped to one with a higher opening temperature. I know on my '01 V70 2.4T the thermostat opens at 195F, and the normal ECT range is 195F-215F.


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XC70Rider
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Re: Engine Temperature Increase after Water Pump, Thermostat and Coolant replacement

Post by XC70Rider » Mon Mar 11, 2019 12:02 pm

The housing appears to be identical so I'll try re-installing the OEM thermostat and ECT sensor to see if temp changes.

To swap those parts does any of the new coolant need to be drained?



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abscate
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Re: Engine Temperature Increase after Water Pump, Thermostat and Coolant replacement

Post by abscate » Mon Mar 11, 2019 2:03 pm

You will lose a bit, like 500 mL if you don't drain down. Cover the alternator, rinse off, top up when done with 50-50.
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XC70Rider
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Re: Engine Temperature Increase after Water Pump, Thermostat and Coolant replacement

Post by XC70Rider » Mon Mar 11, 2019 3:20 pm

abscate wrote:
Mon Mar 11, 2019 2:03 pm
You will lose a bit, like 500 mL if you don't drain down. Cover the alternator, rinse off, top up when done with 50-50.
I'll get another gallon at the local Volvo dealership tomorrow. With the cooling system thoroughly cleaned out I don't want to risk reusing a half liter of drained coolant.

I've reused coolant using coffee filters and paint screens on cheaper vehicles but not this time. I've already installed at least $1,500 of parts for repairs and preventive maintenance. The only general maintenance remaining is the OEM suspension and exhaust.



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