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> Help! Engine Stays Cold When Driving On Highway
watercoolant
post Dec 10 2007, 05:46 PM
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Hi,

I would like to know if anyone else had a similar experience/solution for the following situation:

I'm living in Montreal, so it gets pretty cold during winter (< -15 Celsius). I found that every time when I drive my 850 on the highway during winter, the engine temperature gauge on the dashboard would drop to almost at its lowest position, and the whole cabin would become freezing cold. Does any of you have similar experience with your Volvo or is it just because there's something wrong with my car? Shouldn't the ECU close off the valve of the coolant hose to the radiator in order to keep the engine warm when it gets too cold?

Thank you very much!
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grendel1960
post Dec 11 2007, 02:13 PM
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Sounds like you need the thermostat checking, sounds like it is stuck open, thus not allowing the system to warm up.
Grendel
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TheGreekMason
post Dec 11 2007, 04:48 PM
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Grendel sound spot on. Just an aside, do you smell coolant in the cabin while this happens? Loss of coolant?
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ampangbear
post Dec 11 2007, 11:13 PM
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While at that, also look at your ECT.

It's just below the thermstat housing.

When you first start the car, if the temperature needle on the dashboard goes all the way up and then falls, then its a classic sign the ECT needs to be replaced.
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watercoolant
post Dec 13 2007, 10:07 AM
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Thanks for all your advices! I never ran low in coolant and only had to replenish it once after I got the coolant temperature sensor changed a month ago. (But the cold engine problem has already started even before that.) As for the ECT, the engine temperature gauge on the dashboard never jumps up and down when I start the car. I am not too familiar with the design of Volvo's, so the thermostat also houses the valve of the hose to the radiator?
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Ryan 20
post Dec 13 2007, 02:11 PM
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If the thermostat is stuck open or there is no thermostat in there then it will run cold.
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Steve7E7
post Dec 28 2007, 04:15 PM
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Got to agree it's the stat.My Tank suffered exactly the same symptoms until I replaced the stat.
Now I know why the 850 is a car for cold climes....the heater pumps hot air right from a couple of miles after setting off!
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99S70GLTWPG
post Nov 16 2009, 12:58 AM
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QUOTE (watercoolant @ Dec 10 2007, 04:46 PM)
Hi,

I would like to know if anyone else had a similar experience/solution for the following situation:

I'm living in Montreal, so it gets pretty cold during winter (< -15 Celsius). I found that every time when I drive my 850 on the highway during winter, the engine temperature gauge on the dashboard would drop to almost at its lowest position, and the whole cabin would become freezing cold. Does any of you have similar experience with your Volvo or is it just because there's something wrong with my car? Shouldn't the ECU close off the valve of the coolant hose to the radiator in order to keep the engine warm when it gets too cold?

Thank you very much!


Hey, did a new thermostat solve your problem? I'm having the same issue right now and dont know what to think of it.

Thanks in advance,
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