Volvo V70 2.4 Estate Automatic

In the most general of terms a diesel engine would operate at 86-92 C.

However, much depends on the distance you are driving. On a very short trip(s) your needle is unlikely to get much above cold on the gauge. That's because an engine needs a minimum of 5 miles before the thermostat begins to open to allow coolant to circulate, and 10 miles before your engine is getting to 'normal operating temperature'.

The ideal position of the needle is N - normal ... midway between cold and hot.

If, on a long run, the needle doesn't get much past the cold mark it's probably due to either a faulty coolant sensor temperature sending a wrong reading to the gauge, or a thermostat which is stuck in the open position.

If the needle is indicating too hot - again it could be a faulty temperature sensor, a faulty thermostat - or other problems.

With a fully warmed engine and sitting in traffic/idling your needle would creep from Normal to Hot .. and then the electric fan would kick in.

Engine Temperature Issue - Please Help! - Mazda 6 Forums : Mazda 6 ...

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Sep 12, 2011 - Join Date: Mar 2006 ... to the gauge) and then after being shut off for 5 minutes, show COLD. ... I'll also confirm, with my AP, that my ECT is around 200 like it normally is. .... VSS, and ECT signals and calculate radiator's heat the radiation ... I noticed my engine temp needle was dipping down and then came ... CEL - Throwing code P0126 (Insufficient Coolant Temperature ...
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Temperature gauge going up and down - CarGurus

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Car Engine Overheating - Causes and Symptoms of Over ...

The fan only operates when the engine/coolant temperature exceeds the thermostatically controlled fan. At idle observe the dash engine temperature and fan. Before the gauge reads above normal the fan should operate.

Do you have an OBDII scanner to check the real temperature? Want to make sure it's not overheating. If it's normal, could be your temperature sensor starting to go out, or ignition switch. Any check engine lights? If so, get the code for me, can go from there. At a constant speed, you sure it wasn't a misfire instead? Check your trans fluid, make sure it's full. I was just in Tahoe, pretty sad not much snow at all.

It should normally be right under the halfway mark. Anywhere over the halfway mark make sure theres coolant, and if there is coolant check hose for leak.

It is not overheating that is well within the normal range. If the engine gets to hot you will get a check engine warning light.

have a mechanic test the oil pressure with a mechanical gauge
it is more than likely that the electric sender unit has failed and is sticking internally
the tic noise could be a relay working from an intermittent power supply or bad ground

180 degrees. Usually the middle.

If a 12 year old car is overheating, the owner might want to have the cooling system checked. the correct amount of and type of coolant in the radiator. no leaks anywhere in the system. radiator cap and water pump working correctly belts are in good condition and with the correct tension. Engine block thermostat working properly and in good condition. No obstructions in the engine block or radiator. All the hoses are good and not leaking.