Question about 1993 Volvo 960

2 Answers

Overheating motor gets hot but the temp guage does not move, the radiator fan does not go on and eventually hose blows off

Posted by on

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Volvo Master
  • 716 Answers

Is the problem occurring very rapidly before the thermostat has time to open? If it happens so quickly the temperature gauge will not have time to give a reading before the hose blows. i.e is it happening within a couple of minutes?

There is a possibility that the hose is perished/split inside although there are other faults which can cause identical symptoms to what you describe.

If the water pump is not working and pushing the coolant around the engine this can cause 'hot spots' around the cylinders and head. The coolant here will overheat whilst coolant elsewhere in the engine will remain relatively cold because it not been circulated. However, don't jump to conclusions about the water pump. Some cars way back had plastic impellers on the water pump to circulate the coolant. The plastic impellers used to wear away meaning that just a spindle was left spinning in the coolant - doing nothing of any use. Don't jump to water pump conclusions.

First of all identify whether there are any actual leaks. Not just in the hoses, radiator and heater, but also around the water pump. Failed bearings/seal in the water pump can permit coolant to drip out onto the outside of the engine block.

Then identify whether/if the car is losing coolant when the engine is switched off or running. With a cold switched-off engine fill the radiator expansion tank to the max mark with water. Give it a couple of minutes to settle in case you need more water to bring it back to the max level.

Leave the cap off and let the car stand overnight. In the morning check the water level. If it has dropped there may be a leak that you haven't yet found. Leave the expansion tank cap off and start the car and peer down into the expansion tank (though keep your face out of harms way..)

Normally, a few air bubbles will appear as the coolant circulates and 'bleeds' itself of air. This is quite normal but should stop after a couple of minutes. As the coolant warms it will rise in the expansion tank. If the bubbles keep appearing or seem quite violent and frequent this may point to a cylinder head/head gasket problem.

A warped/cracked cylinder head or a cracked/burnt head gasket allows exhaust gases into the water jacket (the cooling system) which then pressurises the coolant, causing bubbling to appear in the expansion tank and hoses to leak. There is also a possibility that the engine may 'pink' and run rough as well as overheat if run.

A workshop should be able to test the coolant in the expansion tank for contaminants from the exhaust system. If those contaminants are present in the coolant, then in all probability there is a head/gasket problem.

Years ago there used to be 'head weld' additives that relied on floating particles to seal cracks. The additive was simply poured into the radiator/expansion tank as a TEMPORARY get you home fix. Now I believe that there's new additives which don't rely on floating particles to cure head/gasket problems. Here in the UK the new coolant additive is marketed as 'steelseal' and at around 45 dollars a bottle it isn't cheap, though if it does what the makers claim -permanently fix head/gasket problems- it's still a lot cheaper than fixing the head. I've never used it.

A cylinder head job takes 2-3 days. The head must be skimmed prior to refitting. Refitting an unskimmed head just means that you are refitting a warped head back onto the block. The problem hasn't been fixed. As a very general rule of thumb, it costs about the same to fit a 2nd hand engine as it does for a workshop to repair a cylinder head fault. It is of course easier and quicker to replace an engine.




Posted on Sep 17, 2008

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Novelist:

    An expert who has written 50 answers of more than 400 characters.

    Governor:

    An expert whose answer got voted for 20 times.

  • Expert
  • 97 Answers

If the temperature gauge isn't moving you are either completely out of coolant or your coolant isn't circulating.

It would be worth your time to check your coolant level, then look for leaks. If you are also noticing that your heater doesn't work it would help to confirm this diagnosis.

Could be several things causing a lack of circulation: a blockage in your coolant lines somewhere, your water pump is not functioning, or you have a blown head gasket or warped cylinder head. An engine overheat can also cause the blown head gasket and/or warped cylinder head as well, so you would be best served by driving your car as little as possible until you've diagnosed the problem.

If you are out of coolant, you should check a few places for leaks. Obviously at your main coolant lines, but also along the heater core is a good place to check. If you can't find any obvious leaks, you may want to try flushing your radiator, since it's relatively simple to do and certainly can't hurt. Also change your oil: if it comes out looking opaque and like a milkshake, you're getting coolant into your cylinders, which means you've blown the head gasket or warped the cylinder head.

-R

Posted on Aug 13, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

2000 landrover overheating


Start the engine and warm up. Feel the upper and lower radiator hoses while it is warming up. You should feel heat suddenly in one of the hoses-usually the top hose. If it does not get hot but the engine get hoter than 1/2 way up the guage then you have a bad thermostat.

Dec 20, 2013 | Cars & Trucks

1 Answer

Temperature guage not working and engine overheated when stopped in trafic


The powertrain computer turns the fans on through the cooling fan relays, based on information from the coolant temperature sensor. The fans will only come on when the coolant temp. is pretty high-varies by manufacturer, but it is over 200 degrees, some as much as 230 degrees. So the fans will not come on when engine is started, but they should come on before the engine overheats. You should have them checked. Also find out if the temp. gauge sending unit is separate and different from the coolant temperature sensor-on most cars, they are separate, maybe not on yours?
Free advice from a shadetree-not worth a lot, eh? lol.

Sep 24, 2013 | 2005 Ford Escape

1 Answer

Relay switch for fans on 99 dodge caravan keeps blowing causine engine to over heat ng


If the relay is getting too hot, the most common problem is a faulty radiator fan. The fan motor pulls current thru the relay. The radiator fan motor may be failing after it runs for a period of time.

Jul 05, 2013 | 1999 Dodge Caravan

2 Answers

1990 dodge dakota 2.5 over heats temp gauge erratic


For car running hot and overheating issues, I suggest to you go through this help links. Click this link below and go through the troubleshooting procedure to take care of the problems: ----

temp gauge goes erratic? http://technoanswers.blogspot.com/2012/01/heater-blows-intermittently-and-temp.html

--------

Temperature gauge keeps fluctuating up and down close to red? http://technoanswers.blogspot.com/2012/01/temperature-gauge-keeps-fluctuating-up.html

--------

Car runs hot? http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
-----------All types of car overheating problems and troubleshooting?

http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
Car freeze overnight and started overheating while driving?http://technoanswers.blogspot.com/2012/01/car-freeze-overnight-and-started.html-----------Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

---------------------------

Car overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
--------overheating? http://schematicsdiagram.blogspot.com/2011/12/buick-century-overheating.html
----------Car engine Overheats and transmission starts slipping?http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
----------

Temperature gauge does not move and no heat when heater is ON? http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html

---------

This details will help.Thanks.

Feb 07, 2012 | 1990 Dodge Dakota

1 Answer

I have a 1995 chrysler cirrus and the heat will not work. Changed the thermastat and still will not work. not sure if the heater core is bad. The hoses are getting hot to the temp they are supposed to but...


Check you fan. If the heater core is still hooked up, you would have to be circulating the hot water through the heater core, then it becomes the issue of the duct route and the fan to help move it through the vent. Fan motor should be easy on this car. Good luck. Make sure you have radiotor fluid in the radiator.

Feb 21, 2011 | 1995 Chrysler Cirrus

1 Answer

2003 Nissan Altima. A/C quit & engine overheated.


verify the radiator fans, fuses, relays of fans. when you turn on the a/c all the radiator fan turn on too, if not you have a problem with it.

Jun 01, 2010 | 2005 Nissan Altima

2 Answers

Car overheating when in idle. fluid level and


Your problem may be that your fan clutch has gone out. When the car is moving, it's cool, but when stopped it's idling, the engine starts 2 get hot which causes the temp to go up. The fan clutch spends the fan, which cools the engine while stopped. I had the same problem. Once you get your new one, you would probably want to get a new thermostat as well, but ask the mechanic first.

Jul 18, 2009 | 1999 Jeep Grand Cherokee

1 Answer

Overheating


When you mention the radiator having a hot upper in pipe and a cool bottom out pipe tells me that the coolant is not moving around the engine. This could be down to a water pump not working, blocked radiator, thermostat not opening. The bottom hose should be cooler than the top hose but once the engine is up to working temp which is around 85/90 degrees c for an audi the bottom still should be farly hot to touch. Hope this helps

Jun 01, 2009 | 1996 Audi A4

2 Answers

Ford mondeo mk3, intermitent dumping of water from cooing system,found crack in header tank, changed same,ran car at idle, temp guage at normal & heater blowing hot , took car for run , temp guage off...


You may have an air pocket in your system which some times happens.  One way to get rid of it is to take the upper hose off on the engine side,  fill your system with water until it runs out from your engine block, replace the hose, start your car turn you heater on and set to hi keep the radiator cap loose until the temp start to rise then close tight.  Once the air pocket had been remover you can drain some of the water from the radiator using the lower drain plug and add antifreeze.   

Mar 09, 2009 | 2001 Ford Taurus

1 Answer

2000 Elantra Overheating


First when vehicle is cold like in the morning check and make sure that the vehicle has enough coolant/ antifreeze in radiator and reservoir. If coolant is need use a 50/50 mixture of water and antifreeze. You will need some time to do this let car run at idle until the temp guage is in the middle NOT+ normal operating temperature. At this point if the thermostat should be in the open position. Let vehicle run and check to make sure that radiator fan comes on. This should come on when guage is about midway/half way. If temperature rises above half going to h/hot and fan doesn't come on, you either have a BAD FAN BAD FAN SWITCH BAD FAN RELAY OR BLOWN FAN SWITCH FUSE. You will need to check all of the following I will help if its needed. If fan comes on and doesn't go off and vehicle continues to get hot even with fan running. Feel radiator hoses and see if the lower radiator hose is cool/cold. If it is you have thermostat that stuck closed. Replace thermostat and fix problem. If all the above is good and vehicle continues to over heat. THE BAD NEW IS THAT YOU MAY HAVE A BLOWN HEAD GASKET /CRACKED HEAD /BROKEN WATER JACKET. Basically you will need a HEAD JOB at least a head gasket. ONe tell tail sign of this is oil looking like milkshake/chocolate milk-a creamish while residue in oil or antifreeze. Contact if you need hel0p. Good Luck and thanks for using FIX YA

Jan 10, 2009 | 2000 Hyundai Elantra

Not finding what you are looking for?
1993 Volvo 960 Logo

585 people viewed this question

Ask a Question

Usually answered in minutes!

Top Volvo Experts

yadayada
yadayada

Level 3 Expert

61168 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Mark Jones

Level 2 Expert

76 Answers

Are you a Volvo Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...