Question about 1986 Isuzu Trooper

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Heater leaking coolant

I have replaced the heater unit twice. And it still leaks. I put stop leak in and it stops leaking until I move the temputer control. I need to remove the heater core. But the factory manual doesn't show how. Help NEEDED!

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  • Anonymous Mar 22, 2014

    i changed thermostat

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  • Isuzu Master
  • 1,075 Answers

You seem to have a lot of pressure ,you need to get this engine pressure tested i would suspect mybe head gasket

Posted on Nov 14, 2009

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1 Answer

How to flush heater core after stop leak was put into radiator


undo the both heater hoses at the engine fire wall
turn the heater control on
apply a garden hose at one of the hoses and flush through
do it both ways
Two things to consider
stop leak should only work at the area of the leak and circulate normally with the coolant so there should not be a blockage
second point is , if the heater core is blocked then flushing will hot clear it and it may need a new core
It is known that some stop leaks affect the coolant control tap of the heater so it may be that control unit that is the problem and not the core so keep that in mind before replacing the core

Dec 20, 2015 | Cars & Trucks

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1998 Chevrolet Cavalier 2.4L losing coolant quickly


Stop Leak--can't get that out & it will plug the heater core
& other things --- bad move.

Why are you driving a car with any coolant leaks?

You may have ruined the motor by now

We can't find your leak from the internet or guess where it is

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Loss of coolant


You dont have an evaporation problem. You have a coolant leak in your recovery tank. Its located at about one inch above the bottom of your recovery tank.

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I have a 2005 Honda civic I have no heat when I stop the car for any reason. I have wonderful hot air while the car is in motion. The thermostat has been changed twice. The radiator is brand new. A new...


Change fan belt (I know sounds stupid) but if it's slipping from being loose or glazed it won't spin waterpump fast enough to circulate coolant. Sometimes the obvious is easily overlooked.

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Green liquid leaking into the passanger floorboard


You need to replace the heater core as it is leaking coolant.

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Heater blows hot air while car is moving but cold air while idling. The intake manifold was changed last spring, the thermostat has been changed 3 times and the temperature sending unit has been changed....


That sounds like the coolant level is low. If it is not the use of "stop leak" has probably caused a partial clog which restricts the flow of water unless the vehicle is turning higher RPMS. While sitting still raise the RPMS to about 2000 and see if the heater blows hot air to see if the above mentioned problems are fact.

Nov 21, 2010 | 2002 Chevrolet Impala

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2002 taurus, power windows all stopped working at once along with lighted window switches. Drivers window stuck down. Relay was hot! Also heater blows cool air, started doing this after I added radiator...


LOOK FOR BLOWN WINDOW CIRCUIT BREAKER.YOU HAVE A SHORT IN WINDOW SWITCH OR BAD WINDOW ELECTRIC MOTOR.YOUR HEAT PROBLEM IS A STOPPED UP HEATER CORES.THE STOP LEAK STOP ITS HEAT.THE STOP LEAK HAS STOPPED OR PLUGGED YOUR HEATER CORE SO COOLANT CANT PASS THROUGH IT.YOU GOING HAVE TO FIX RADIATOR LEAK AND REPLACE HEATER CORE TO GET HEAT AGAIN.

Jan 28, 2010 | 2002 Ford Taurus

1 Answer

I put stop leak in radiator and now the car blows cold air vs hot air when running the heater. why?


The stop leak have restricted the coolant flow to your heater core. You can try flushing out the Stop leak with Preston Radiator flush or replace the heater core. Once Cooling system flushed out, replace thermostat, radiator cap and repair coolant leak. Good luck and hope this helps, and Note: Common Black kitchen Pepper does great as a radiator stop leak without leaving any residue and can be cleaned out of the system with water and not coolant flush. Two table spoon is more then enough to stop a small leak. Good luck and keep me posted friend.

Jan 11, 2010 | 2000 Buick LeSabre

5 Answers

Can i put leak stop in the resevoir of the radiator


NO-NO-NO-NO NO

If you have to use stop leak drain out some coolant and remove the upper rad hose and poor it down there. IF you put it in the reservoir it will sit there and stop the return. You will think it is full and your system will be empty.

If you have 4.0 you may have a head gasket leaking. If it is running ok and you are loosing coolant contact me back and I will tell you a good fix that works

Aug 20, 2009 | 1998 Oldsmobile Aurora

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We first noticed a problem when our 98 expedition started overheating, we put in the coolant and went on our way. A few days later smoke started coming in the vents when the AC was on high. We checked the...


Your auto is definitely loosing coolant and will overheat. Check your thermostat, hoses, belts, radiator cap and water pump. If you do not fix the leak or coolant circulation problem you can destroy your engine. The smell inside can be being picked up from the outside vent or it could be your heater core inside the ventillation area leaking (which could be your coolant leak).. If that is the case you will need to replace the heater core.

Jul 10, 2009 | 1999 Ford Expedition

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