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Overheatin an leaking engin coolant - 2003 Chevrolet Blazer

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I need to know more about the leak but that is why it over heats the coolant system depends on pressure in the system to keep temp at 198-212 degrees if pressure is released temp goes up once the leak is repaired so is the overheating

Posted on May 03, 2010

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4runner overheatin


overheating is usually a sign of a loss of coolant. check your hoses, your radiator, and your thermostat housing. if you aren't leaking coolant through those, check your oil for signs of a white/milky look to it, and the texture of a melted milkshake. if your oil looks like that, you have a blown head gasket, or a warped head.

Sep 17, 2013 | Toyota 4Runner Cars & Trucks

1 Answer

The cooling system electric fans keep running for over 45 minutes. The engine temp gauge was in the normal range. There is no thermostat in the cooling system, the radiator was warm but not overheatin


there has to be thermostat sensor in the system. this is how the cooling fan is controlled.the water pump may be failing by not pumping enough coolant and causing the fan to run.longer that expected

Jun 24, 2012 | 2000 Dodge Caravan

1 Answer

My car is overheatin and has no heating inside


Please check the line from the jacket to the blower unit as this can be clogged and so there will be no flow of the hot water to the blower unit.
Some tips for overheating are given below:

The overheating of the car can be due to many reasons and you need to check on each one to confirm the working of the system.
1. In the first place the working of the engine must be assessed. it must be smooth with a good indication that the tuning timing and the power seems good. This will confirm that the settings of the engine is good and so there is less scope that the engine seems to heat up on its own.
2. Secondly the radiator pressure cap must be tight and good, the radiator MUST not loose coolant after a run or in a few days time- since this must be a sealed system and there is no scope of water overflow or loss unless there is a leak- sometimes the leak is too microscopic as under high pressure only steam might escape and so reduce the coolant. So check for leaks while the engine is hot , specially the radiator, the hose or the fittings.
3. The working of the water pump must be good to ensure a good flow and circulation, so check for leak in the water pump, check for presence of water in the exhaust or leaking on the engine gaskets.
4.Make sure that the coolant is good and clean if not drain and refill , if there is presence of rust please have a good flushing of the radiator or else the chances are that the radiator ports can be blocked and reduce the efficiency of the cooling .
5. Finally the cooling fan, the radiator fan must be working, check the thermostat/thermistor to work accordingly with good flow, have a good water jet wash on the radiator for a clean radiator cooling fin exposure.

Jan 04, 2012 | Cars & Trucks

1 Answer

Ford fiesta overheatin when driving


check coolant level, Maybe is air in cooling system. If coolant is ok check oil - is it ok (Brown or white?) If its ok and still hawe problem - is thermostat faulty.

Mar 16, 2011 | 2011 Ford Fiesta

1 Answer

I have A nissan frontier 2002 with overheatin problem I chance the heater core the radiator cap I check the radiator and the overheat problem continue


Check the water pump for leaks by its weep hole. Also remove its drive belt and see if its pulley is loose. if so replace the pump

The other items are the cooling fan, fan relay(if applicable) some models use a clutch, check clutch see if its engaging at proper temperature.

If you determine it to be the water pump might as well do timing belt/ chain and corresponding engine seals and oil pump at the same time. May cost a lot now but got about 60k before some of theses items become an issue again.

May 20, 2010 | 2002 Nissan Frontier Crew Cab

2 Answers

Overheatin while on a long trip at traffic lights 91 toyota cressida


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

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

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

This test will kill two birds with one stone.

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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!

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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

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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.

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

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Nov 12, 2009 | 1989 Toyota Cressida

1 Answer

Overheatin. think it't thermastat but can't find it. deffinetly not an oil or engin problem. also no leaks or breaks of any sort.


it usually is the thermostat if there are no leaks, follow the upper coolant hose on the radiator to the engine block. The thermostat is on the end of the hose. unfasten the bolts and replace withthe new one. ad more coolant if necessary.

Oct 14, 2009 | 2004 GMC Envoy

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