Question about 1995 Mitsubishi 3000GT

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Engine runs hot at freeway speeds. Greggs Japaneese auto replaced water pump and thermostat still gets hot. if you turn the heater on it cools down any ideas?

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The radiator cooling fan does not turn on automatically.

Posted on Sep 27, 2009

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5 Answers

It only gets hot when going speeds faster than 65 or 70 mph for 5 min or so. I can push in the clutch and coast and the temp gauge will start to climb rapidly let out on the clutch and cool back down. I...


Hi

Your engine thermostat is stuck open and this is what is causing the problem. You will need to have a new thermostat fitted - Usual cost is between $15 to $30. Maybe less depending on thermostat type.

How the thermostat works is it remains in a closed position within the engines coolant circulating system to allow the engine to heat and reach its optimum operating temperature. The thermostat then opens to allow the coolant to circulate freely. When the thermostat becomes faulty it fails to respond to the temperature of the coolant. What has happened it that it has opened and is stuck in an open position allowing the water to circulate too freely around the engine - you will see a brief rise in temperature when the engine is worked hard but as soon as you come to rest the temperature falls back again as the thermostat is not closing when it should.

Solution - replace thermostat and all will be well!

Hope this helps. Please remember to rate my answer. Many Thanks.

Jul 25, 2009 | 2002 Mazda 626

1 Answer

Overheating


About the only thing left is the water pump.

Mar 29, 2014 | Mercury Villager Cars & Trucks

1 Answer

Audi a4 2.8l no heat


take the top off the filler cap run engine to boil. keep it full off water to the top. you will see air bubbles coming out as the engine gets hotter. squeeze the pipes on the rads to help the air come out. when fan kicks in turn engine off and leave to cool down.while you are doing this make sure the fan for heater is off but is on full heat. can have fan on number one on speed that is fine.

Mar 01, 2013 | 2000 Audi A4

3 Answers

Engine overheating i have replaced the radiator has plenty of water


replace thermostat.then bleed coolant system, this is how you do it.fill the cooling coolant system with 50 / 50 dexcool and water to raise boiling point,straight water will evaporate boil away cause engine to overheat catch fire thats why you need 50 / 50 mixture antifreeze and water.to bleed coolant system first fill coolant system until coolant stay at the full cold mark on the the coolant overflow jug,then you start engine allow it to idle,place the heater and ac control in any ac setting except max and the temperature control to the highest setting,run engine until lower hose to water pump is hot. with the engine hot run the engine speed up to 3000 rpm and allow it return to idle, repeat this 5 times. slowly open the bleed valve on the thermostat housing or look for bleed valve at the water pump heater hose.open bleed valve for 15 seconds to expel any trapped air.then top off the coolant as necessary,and when top radiator hose hot thermostat open up.keep adding cooling to overflow until coolant level stop at full cold mark dont over fill coolant.if engine seem like overheating while looking at cooling gauge turn off engine wait a while until cool off add more coolant until coolant level stay stable and dont drop any.when open radiator overflow cap use large rag over the radiator cap to keep from getting scald open radiator cap a little at a time but dont open radiator cap until engine cool down first.replace the radiator overflow cap, thermostat,and engine coolant temperature sensor and check the cooling fans fuses and relays see what happens.

Aug 18, 2012 | 1998 Oldsmobile Intrigue

1 Answer

2004 dodge 1500 hemi, 5.7,.....running hot at highway speeds,I have flushed the system 2 times, replaced thermostat.....still runs hot at highway speed.....I have read about " back flushing the...


If running ok at idle and not running hot, then I'd first examine my rad hoses very carefully, especially lower rad hose. If old and soft, easy to squeeze then replace it/them. Also replace rad cap as well. A soft hose may be collapsing when engine RPM increases, and restricting flow through engine. Next would be to observe water flow with engine running to be sure water pump is doing it's job. I assume you have cleaned and checked rad already. Note: if you run at highway speeds and it gets hot, try turning heater on high fan and hot setting to see if temperature gauge goes down at all, which would make me lean toward a faulty radiator.

Aug 03, 2011 | Dodge Ram Pickup 1500 Cars & Trucks

3 Answers

I have a 94 crown Vic I just put a thermostat in it how do u know if it thermostat bad cause it running hot now


If it was running hot before you replaced the thermostat and the new stat didn't help it, most likely you have another problem. First make sure you installed the new thermostat correctly and not upside down and make sure you have purged all the air out of the cooling system. Your radiator could be clogged and restricted, not allowing coolant to circulate. Your fan clutch could be faulty or the radiator fan is not working properly. You could have a bad head or head gasket causing combustion gases to enter the cooling system. The water pump impeller shaft could have broke---These are the most common causes for an overheating problem. Good luck, i hope this helps.

Jul 11, 2011 | 1994 Ford Crown Victoria

1 Answer

Hi all, I have a 5.9 l 2000 Dodge Durango SLT. Recently my truck has been overheating so I came here to troubleshoot unfortunately I cannot find any previous topics on my problem so here it goes. The...


replace your water pump. if youre going to do that, also do the t-stat just because it has been getting hot. refill and use distilled water with your coolant. happy holidays.

Dec 28, 2009 | 2000 Dodge Durango

2 Answers

Over heating


as stated, gotta be the thermostat... when the water reaches a certain temp this valve must open to allow coolant to flow thru the radiator or the water in the engine will get too hot and cause significant long term damage. It's good that you pull over immediately and let your engine cool off. A good emergency remedy to get the car to a safe place or a repair facility, is to run the heater at full blast. effectively using your heater core as a radiator. not ideal but will get a you a few more miles down the road.

Mar 23, 2009 | 2000 Volkswagen Beetle

1 Answer

02 Mitsubishi Eclipse heater gets hot only when in motion


Does your engine temperature guage read normal? Have you checked your coolant level? This can be the result of a partially seized thermostat... there is also a valve in the heater core lines that can seize partially closed. As the engine speed increases, the water pump can force more water through the partially closed component.

Mar 04, 2009 | 2002 Mitsubishi Eclipse

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