Question about 1987 Nissan Maxima

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I have replaced everything related to the water cooling system except the heater coil, yet on hot days, high speeds and climbing the engines get really hot.

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Take off the highest hot hose and expell any air in system(just releasing the clip when the engine is hot may do it)

Posted on Aug 06, 2010

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2002 F250 5.4l gets hot until I turn the heater on high?


have cooling system flushed and clean outside of radiator,get a new thermostat that opens earlier,like 105 degrees instead of 112 degrees.

May 26, 2015 | 2002 Ford F250 Super Duty SuperCab

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

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How to Flush the Cooling System.


Normally the engine operates at 195F, unless you have replaced the thermostat with another one at 185F. If the temperature has a tendency to rise up, the reason is a partially obstructed cooling system or/and a bad thermostat.The first part of the cooling system that gives up is the heater core, because the coolant flowing channels are thin. It is the time for a coolant flush in your car. To do it right then you need time. Plan ahead for a weekend. With a cooled engine, start with the heater core hoses. Disconnect both of them, but the dirt has to go out of your car, so with a garden hose back flush it and let the dirt to get out of your cooling system. After you will get clean discharge,it is the time for coolant bottle, remove it, discharge the used coolant and clean it. The third to come is the radiator. Open the drain cook, or disconnect the lower radiator hose, and disposal used coolant properly. Now open the radiator cap and flush with water the radiator till discharge will be clear.You think that you are done? Not yet. There is half of old dirty coolant trapped in the system. Install everything, and connect all coolant system hoses, radiator, heater core and coolant bottle. Now you have to run your car with water. Fill out the cooling system with distilled water, start engine, turn on the heater high, and run till upper radiator hose get hot. That means the thermostat opens. Let the engine to cool down, open the radiator cap, and draining cook or lover radiator hose and drain everything. You can use flush detergent, if you wanted, at this stage, but flushing with detergent will add 4 more hours, because the detergent is colorless and you have to guess how many fill and drain processes to do, to get rid of it. I do not do it, but if your cooling system is very dirty you have to do it. After the last drain, fill the cooling system with concentrated antifreeze and 30% distilled water. The reason is because it is more water trapped inside the cooling system. The goal is to reach 50/50concentration. You need a coolant tester to find this. Start the engine and add coolant till radiator is full. Install the radiator cap and bleed the system. After driving you car for a day or so, let engine to cool down, open the radiator cap check the concentration of coolant with the tester, and add antifreeze or distilled water as necessary. It is a good idea to replace the thermostat while flushing the radiator. This procedure has to be done every 2 to 3 years. It is up to you to decide to use RED GM Dex-Cool or GREEN Prestone antifreeze. In all my cars I have replaced Dex-Cool with Prestone, but I flush the system every 2 years, and I never had a cooling system problem in all my cars.

on Nov 14, 2010 | Chevrolet Avalanche Cars & Trucks

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Cooling system health and diagnosis for 90's Mercedes.


This is listed under the 300 series but fits most 90's Mercedes Benz cooling systems.
The first thing most people notice about there Mercedes benz is the the temperature needle climbs or sneaks towards the red in there car. This is not uncommon. Is it wrong or bad for the vehicle? The plain answer is no.
First lets talk about what is going on. The motor heats the water, the thermostat holds most of the water back to keep the block a more constant temperature. The water pump is always pumping while the motor is running so none of the hot water goes the wrong way backwards into the radiator or coolant overflow tank. The radiator is cooling off the coolant by either driving, viscous fan or the electric fan or fans your Mercedes has up front when stopped or slowed. When the thermostat reaches its set temp around 85-95 it fully open until the block fills with cooler water then shuts again, filling the radiator with hot water to be cooled. All in all pretty simple system to keep the block cool and evenly heated to keep stresses down.
Now some do not like the fact there system goes so close to red. Well one contributor is the Air conditioning system. When that compressor kicks on it basically is just a pump that transfers heat out of the car into the engine compartment making the cooling system work harder.
Another cause of climbing heat systems is a failed thermostat closed or open that keeps the system water hot in the block or hot throughout the system. Best fix is to of course replace it. Just follow the top hose unbolt it from the block and insert the new unit with proper gasket and direction and its good to go.
A bad or failing water pump can limit water circulation so if your car doesnt cool off after replacing the thermostat its the next to replace. Kind of not a simple Do It Yourself job with all the belt and pulley issues that may come up due to age. Not impossible just not easy.
Leaks in the system can cause boiling and rising temperatures so look around. The coolant tank small hose to the radiator on either end is normally the first, or even the winshield washer deicer or heater core lines. Cap can go bad but you will normally see a bad gasket on it if it fails.
Radiators can become clogged with scale after years and years of service with limited flushes and not adding distilled water. Sometimes the plastic cracks and just need replaced.
Ok now there are some external parts to the coolant system that directly effect it.
The viscous fan, it can lose the oil it has internally and not spin enough to cool. The rule is with the engine running if you can stop it easily with a rolled up newspaper replace it.
The engine temp sensor is normally 2 wire sensor near the front of the engine close to the intake normally. When it goes bad it will not let the electric fans come on when needed. If your having issues, cheap fix replace it.
The last piece of the system is the electric fan/fans. These have alot of integrated systems to look at if they do not work so just be careful. First there fuse is not in the fuse box. It is a aluminum strip fuse normally located on the firewall inboard of the brake booster in a tootsie roll sized container. When it goes out the fans do not come on. First without the A/C on operation is as follows 105 fans kick on low speed kick off at 95. So as you can see the needle will easily climb close to red in traffic again stay calm this can be normal. When the A/C is engaged (in a system with proper charge and working order) the high speed fan operation will happen independent of engine temp. This is because all the heat being transfered by the compressor as noted earlier.
I hope this sheds some light on some cooling system woes of anyone. This may apply to alot more vehicles but is specific to Mercedes. Operation of the coolant system is similar no matter what car you drive (unless its electric or air cooled of course).
Thank you.

on May 21, 2010 | Mercedes-Benz 300-Class Cars & Trucks

1 Answer

Overheating of my 2001 Ford F-250


When you fill the system make sure the heater is turned on. An aftermarket hose coupler with a backflush kit can be inserted in the heater line. Or with the engine cold, disconnect the rear heater core hose from the intake and fill the heater hose as the high point in the system.

Another possibility is if you have a Radiator electric cooling fan. Water cooling is not adequate. Your electric cooling may not be turning on or may be missing high speed.

Bad head gasket. Aeration coming from a leaking cylinder can force hot compression gases into the cooling system. This will disrupt water flow and put hot exhaust gases into the water system.

Feb 12, 2014 | Cars & Trucks

1 Answer

2001 VW Beetle heater not heating.


If both your heater hoses are hot, the heater core is circulating fluid. If only one is hot, and one is cool-then the core is plugged or has an air block, or a valve in the heater line is closed if that applies.
If the engine stays at normal operating temperature, doesn't overheat at all, there should not be a problem with the water pump.

The problem may be with the doors in the heater case not operating properly.

Nov 26, 2013 | Cars & Trucks

1 Answer

I have a 2003 alero with the v-6 what happened was driving down the road the heater works fine. then all of a sudden it was blowing cold air and the temp gauge started climbing. it started blowing how air...


Sounds like the water pump is cavitating . Replace water pump. Check coolant level also. Open the bleeder valve usually located on thermostat housing to remove air from system. close valve when coolant is present while filling. close radiator cap and top off recovery bottle to correct level. These engines are prone to overheating, do not let temp gauge get in the red.

May 01, 2017 | 2003 Oldsmobile Alero

2 Answers

Not much heat if fan is on high, better heat on 2nd speed, rev engine to 4000rpm very good heat on high, Replaced thermostat, replaced water pump,same problem, waiting for gasket to dry before I rev engine...


There is air trapped in you cooling system. Applying vacuum to the cooling system with the engine off through the radiator or surge tank should extract the air pockets in the heater core.

Dec 14, 2010 | 1997 Jeep Grand Cherokee

1 Answer

My wife's Focus loses power if the car is driven up hill on a hot day. She either has to keep the speed above 65 or let it drop down below 40. This only happens in the summer months when the temp is...


Does the engine temperature climb too high? She may need the radiator core blown out with compressed air from the inside to get rid of the bugs and other debris. Does the anti-freeze look clean or rusty? Flush and clean the system if it looks rusty--fill with fresh 50/50 water/anti-freeze. Check the action of the cooling fan(s). They should turn freely by hand when cold. Check the fuel pump pressure and replace the fuel filter. Does the check engine light come on? The O2 sensor(s) may be getting tired. Replace if a lot of miles on it (them).

Aug 19, 2009 | 2000 Ford Focus

2 Answers

My 2003 Explorer overheats when I turn the A/C on.


Q: Temp starts to climb by how much? If the vehicle interior is hot"over 90" , keep in mind the heat in the vehicle is being absorbed by the a/c and carrued out to the "condensor" in front of the engine radiator. Engine temp should be expected to climb somewhat. As the interior cools down the less heat is taken to the font and forced through the engine radiator. It should peak out ,then staer deopping or stabilize. On initial entry of vehicle on hot days it would help to open the windows for a mile or so to purge excessive heat from passenger compartmentw/AC OFF. OUTSIDE CAN BE 90 AND THE INTERIOR OF A CLOSED UP VEHICLE CAN CLIMB TO 120 DEGREES + mID 80'S IS HANDLED WITH GREATER EASE FOR A COMBINATION OF TECHNICAL REASONS OF WHICH WOULD BORE YOU.It sounds like all is well so be cool(pun) and don't waist money chasing a ghost. Happy trails. Oh, The auxillary fan is good to speeds up to 35 mph. Above 35 the forced air from the vehcle speed does the fans job.

May 11, 2009 | 1998 Ford Explorer

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