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Check that the fan is turning in the right direction, in all the changes it is possible that you may have crossed the fan wires and not the fan is blowing forwards instead of backwards. Also check that there are no air locks in the system and that there is a positive flow of coolant.
U need to try bleeding the cooling system, here is how u do that.
The generic method of bleeding air from the cooling system is to use a floor jack and raise the front of the car as high as poss, then fill the coolant recovery tank full and run the engine until it just starts to overheat, high end of normal zone on gauge, then shut the engine down and run cold water over the radiator core, this will self bleed the system and the coolant will be pulled from the recovery tank, repeat as necessary, never let the recovery tank run dry or more air will be pulled into the cooling systeml , if it still overheats then you need to have the head gaskets checked with a gas analyzer for hydrocarbons present in the radiator or recovery tank
first you need to check your cooling fan working you can do so by turning your a/c on if your a/c is working properly/if so turn off a/c and let car sit till overheat and see if fan kicks in.if not possible your fan circuit electrical or sensor related/and also check for air in your system bleed system good check for circulation open radiator cap.
The water pump has what's called a 'weeping hole' built into it. If the pump is bad You'll se water coming out of the hole. When was the last time you flushed the radiator? It may be your radiator cap is bad, they should be changed once a year & the radiator flushed. You can also test ur thermostate. take out ur thermostate & put it in a pot of water so that the water covers the thermostate. Then put a cooking thermometer in the pot to & heat the water til it says 195. u should see the car thermostate begin to open. if it don't it's bad & needs replacing.
Volvo Radiator, Thermostat and Sensors
system's temperature controls include all coolant temperature sensors,
Volvo thermostat, Volvo radiator or expansion tank cap, cooling fan(s)
and fan clutch (if equipped). These cooling system parts function
primarily independent of the engine but control the engine either
through cooling or by sending control signals to your Volvo's
The Volvo thermostat is a spring-loaded
valve that opens and closes based on the temperature of the coolant
flowing through it. A high temperature reading followed by a drop to
normal temperature (or a continuously low temperature) is a common
first sign of a sticking Volvo thermostat. However, many other
conditions may cause these symptoms, so you need to know how to
eliminate each possibility.
The Volvo radiator or expansion
tank cap is also a spring-loaded valve reacting to system pressure. It
serves to maintain proper system coolant level at predetermined
pressures. It must always be replaced with an exact replacement cap
with the same pressure setting. Never use other caps except for
A belt-driven fan blade for pulling
air through the Volvo radiator is usually on the Volvo water pump
pulley and should have a fan clutch to control it. The fan clutch
allows the fan to turn with the belt at low engine speed and
"free-wheel" at higher speeds. A bad fan clutch either doesn't allow
the fan to spin at low speed (overheating in traffic) or doesn't allow
it to free-wheel at high speed (potential overheating on highway or
reduced gas mileage).
An electric fan can be either by
itself (usually front-wheel drive) or auxiliary (used with a mechanical
fan). Both types are controlled via a temperature sensor - in the Volvo
radiator or upper Volvo radiator hose or on the Volvo thermostat or
Volvo water pump housing. This sensor is usually an on/off type switch
with a fixed temperature setting. (Some vehicles may have 2-3 settings
for multi-speed fans.) This sensor is commonly called an "auxilliary
Other common temperature sensors are: 1) gauge
sender (variable output); 2) warning light sender (on/off type); 3)
lambda and/or fuel injection sensor(s) (variable to control fuel
injection settings); 4) thermo-time switch (cold start valve control).
Your Volvo may have other sensors as well.
control is critical to both performance and emission control.
Unfortunately, this system is the most difficult to troubleshoot
without proper equipment and diagrams. It's even more difficult with
computers that adjust timing, idle speed, vacuum and fuel delivery
automatically to make up for potentially faulty temperature sensor
Maintenance of your cooling system sensors is
virtually impossible since there's nothing really to "maintain".
Keeping them clean both internally (coolant replacement) and externally
(engine cleaning) is the best way to ensure trouble-free driving.
Checking and replacing all parts at the factory-recommended time or
mileage limits helps as well
1. start the engine and leave the radiator cap open. 2. put a cardboard cover or a rug in the front of you radiator. 3. let it runs 20 minutes or more, see if it is overheated and see the water or coolant in the radiator circulated or not. If not, as soon as you have already changed water pump. thermostate and check the hoses, no leak, I think your radiator was blocked.