I have a 2005 Buick Century with a 3.1L engine. Here’s my problem: The engine takes too long to warm up in cold winter weather. It runs too hot in the summer. The radiator fans are working at both high and low speeds. Is it possible the thermostat is stuck at a midway position between fully closed a…

Two possibilities (at a minimum): Your thermostat is stuck halfway, or it’s stuck full open and something else is causing the high summer temps, like a partially-plugged radiator. So I’d replace the thermostat, since that would be needed in either case. I’d use the 195F thermostat. Is the coolant i…

When was the last time you drained and flushed the system? If the answer is “I don’t know”, then it’s past time to drain and flush the system. DIY? Buy a new, quality, thermostat and test it in a glass of water (see youtube). Drain the system and remove the thermostat. Use plastic to cover all c…

Possible air pocket in the cooling system… But a OE temp t-stat is cheap, labor might be about 2.4 hours, but worth trying… Me I would check for any codes, check live data for the ect and then hook up my coolant pressure gauge at 0 pressure to start with and start the vehicle cold to watch the pres…

Good point about pressure and the cap, cheap to pressure test the system and cap, and check temps elsewhere. Lots of possibilities.

[image] jmcarc: Is the 180F thermostat for warmer, tropical climates? The engineers designed your cars cooling system to run at 195 degrees, the faster it gets there, the sooner the engine is the most fuel efficient. Generally, people put in a lower thermostat to get heat sooner. I don’t see…

I’d be looking at the thermostat. You may find it looks something like this. [broken thermostat] Tester

Not the same car but when we had a car slow to warm up in winter it was the thermostat that was the problem. Back to normal with a new thermostat. Had our trusted mechanic do it for a reasonable price.

The old thermostats tended to stick closed. The new $25 ones seem to stick open, but I haven’t had a bad one in years. Along with flushing the coolant, new oem thermostat, and checking the water pump, bugs clogging the radiator can reduce performance. Bug screens aren’t used much anymore.

The most common “faulty thermostat” failure for me is warped. The warped valve doesn’t seal completely, so it acts like it is partially open all the time. Asking a shop to removing the existing thermostat for a look-see is the OP’s first step. If the thermostat has never been changed since the …

[image] George_San_Jose1: Asking a shop to removing the existing thermostat for a look-see is the OP’s first step. Pay a shop to look at it ? Just have a new one put in and be done with it.

Stuck Thermostat?

Maintenance/Repairs

VOLVO-V70 July 14, 2024, 8:19pm 17

And just how often is that going to happen ?

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Stuck Thermostat?

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