Question about 1996 Volvo 960

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Volvo overheating Running hot and over heating. Replaced thermostat and its still doing it. Whats going on here

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  • Volvo Master
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If it was over heating before the thermostat was replaced you may have a problem with blocked cores in the radiator. Several tests to do to isolate the fault. Have a coolant a pressure test done to determine if any leaks. Have a compression test done to check for head gasket and cracked head. have a flow test done on the radiator to check for blocked cores. Check that the thermostat was installed correctly ( right way up) Check that the fan is coming on and if viscous fan hub then check that the hub is operational ( Over heating at lights)

Posted on Dec 31, 2013

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Posted on Jan 02, 2017

Mustgo
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SOURCE: 94 Volvo 850 turbo still running hot

Do the air purge test below.

The fins/turbine on water pump can be totally worn out.

====

When the car is completely cool,check the electric fan(s) for smooth rotation.

Clean/check/change the thermo sensor,contact and wire.

===

Excavate air pocket in coolant system / check for head gasket leak

This test will kill two birds with one stone.

===

MAKE SURE THE COOLANT SYSTEM and ENGINE IS COLD!

RAN THIS TEST IN A WELL VENTILATED AREA ONLY!

You will spill some coolant during this air pocket purge test.......BE KIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!

===

Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .

Top of the coolant reserve tank

Let it ran for 10-15 minutes.

Monitor for air pockets escaping from coolant reserve tank.

Small amount of bubbles is OK at 1-5 minute mark

After the thermostat open up (after 195 F warm up) at
5-12 minute mark or after high idle you should see less bubbles.

If you do not see any in rush of bubbles then your thermostat may be partially stuck or rusted badly inside the thermostat hosing.

Give the thermostat host few gentle taps.

If you see larger bubbles surfacing after 15 minutes then should do a hydrocarbon (HC) dye test to test for potential head gasket leak.

Let engine cold down and top off coolant reserve tank.

Start monitor for coolant lost

===

A coolant flush is require every 2 years or 24,000 miles.

I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.

Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.

===
Please post more information by clicking the comment link on the top right corner.

DON'T FORGET to RATE ME if my tip is helpful to you!


Posted on Dec 05, 2009

  • 119 Answers

SOURCE: My 1996 Volvo 850 2.4 I5 non-turbo appears to be

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.

Posted on Jan 13, 2010

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