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Cooliant leaking in the area of the thermistate housing.what could be in that area , such as a bypass hose that is hard to spot?

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Its more likely to be a leaky gasket

Posted on Aug 21, 2010

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A hard to find water leak on 2005 chevy trailblazer 4.2. i think its the resivoir or a hose but not sure exactly, is there a common leak with this vehichle in that area?


Use a white paper towel and dip it on wet spot, if no color then it is water, probably from A/C accumulator which is normal for all vehicles with A/C, if Pink (dex-cool) or green its antifreeze which could indicate a problem. No towel?, taste it on end of your finger, sweet means coolant no taste means water. Do same thing for wet passenger floor area to determine fluid. If sweet or colored there is a coolant leak from the heater core , if water it would be from some other source unless heater housing broken and rani water leaking down from the heater fan cage.

May 25, 2014 | 2005 Chevrolet Trailblazer Ext

Tip

Engine coolant leak


There are no coolant lines etc running on the lower part of the engine.Usually water will leak from above and run down finally dripping from under the engine. Coolant will not leak from the "engine" it leaks from a hose or thermostat housing.


Start from the top and work down. Check each hose by feeling with your hand. Look for a wet spot. wipe the hose with a cloth to clean if necessary. If you think you found it dry the area and check again.Sometimes you need to move the hose around to open a small tear and expose the leak source.

Tip: park overnight on a piece of cardboard. Look for the spot where it is dripping. This will give you and idea where to look.

If a hose leaks around a clamp tighten the clamp. Screw clamps can be tightened. The spring style can not. Once moved the spring type often leak. If moved try moving to the exact position it was in using the impression left on the pipe. I could suggest though that your replace it with a screw type clamp.

If you find a torn hose you may be able to disconnect, cut the end and reattach. If too short replace.

Check where each hose connects to the engine. This will be the thermostat housing and the heater supply line. If a housing is leaking try gently tightening (careful they crack). Or replace the gasket. Use a new gasket do not just use gasket sealer.

Check at the radiator. There will be a heat sensor there. They screw into the radiator. If it is leaking try to gently tighten (take care you can break it). If that does not work remove the sensor and put Teflon tape on the threads. That should do it.

If you don't see a leak at all. Start the engine and run. This will build pressure in the cooling system. Look for leak using the same process. Careful as the engine is hot.

on Mar 07, 2010 | Volkswagen Jetta Cars & Trucks

1 Answer

Anti freeze leak I hear hissing sound under neath fuel injection system


could be leaking at the top radiator hose going to thermostat, that is a hard spot to see leak remove the air filter and air filter housing look below throttle body you see thermostat housing, check for leaks around thermostat housing gasket and check for leak at the top radiator hose going to radiator and thermostat.if all is good check all radiator hoses for leaks check small coolant lines going to throttle body for leaks and check make sure bleeder screw on thermostat housing not loose it will leak also check around radiator and water pump heater bypass metal lines for leaks.

Sep 10, 2012 | 1999 Chevrolet Lumina

1 Answer

I was leaking anti freeze so I had a pressure test done. The Thermo bypass hose needs to be replaced.I have the part but I don't know how to install it. Does anyone know how to do this? Thanks


drain enough water out of the rad to get the level below the area you are working on, pull the hose clamps and remove the old bypass hose(if its older sometimes a box knife and a great tool to speed things up here) install the new hose and use new clamps, sometimes in a tight spot rubbing a little oil on the inside of the hose helps

Mar 13, 2012 | 1994 Pontiac Grand Prix

1 Answer

Coolant bypass hose leaking


Ask a local mechanic to have a look it could be a hose leaking or one of these plastic housings ,anything and everything in fact maybe even a core plug or a freeze plug to you .Cannot tell from here thats for sure so please use a local man to investigate this problem for you

Feb 25, 2012 | Chrysler Sebring Cars & Trucks

1 Answer

Changed water pump,thermostat, top rad. hose. still leaking leaking antifreeze from what looks like below thermostat housing. have noticed super small hose from water pump to engine. looks hard to replace....


That is called the bypass hose. It could be leaking but I'd take a closer look at the thermostat housing. If you replaced only the thermostat and not the housing, the housing may be leaking. It's a common source of coolant leaks.

Apr 16, 2011 | 2000 Dodge Ram 1500 Truck

1 Answer

Losing water, presure escaping from the thermostat area, and hear water boiling from water bottle..


Sounds as if you have a bypass hose leaking on the thermostat housing.

Jan 16, 2011 | 2001 Buick Century

1 Answer

I have cooliant leaking on to my disbrutanor, it ran hot for a while then just statd getting real hot real quick even in this cold weather. have another Q i need to know were the thermistat is for a 1992...


Hello your thermostat is located at the end of your upper rad hose it is in the round looking hub with two bolts holding it that's your thermostat housing

Jan 08, 2011 | 1992 Volkswagen Jetta

1 Answer

I am having a problem with antifreeze smell and leak. I can't see where the leak is coming from but I do see spots on the ground. It does not over heat but it does have a sent of pancake syrup once heated....


LEAK COULD BE COMING FROM RADIATOR.WHEN YOU FIRST START VECHICLE UP IN MORNING LET ENGINE IDLE TO GET UNTIL THERMOSTAT OPEN AND COOLANT PRESSURE BUILD UP. TURN ENGINE.OFF. RAISE HOOD YOU WILL SEE LEAK. THE COOLANT PRESSURE WILL PUSH OUT ANTIFREEZE.LOOK FOR LEAKS AROUND TOP RADIATOR HOSE AND LOWER RADIATOR HOSE.LOOK ON SIDES RADIATOR AND LOOK BELOW RADIATOR AREA WHERE COOLANTS FANS LOCATED RADIATOR CORES WILL LEAK AND LOOK AROUND WATER PUMP + BYPASS HOSE + CHECK HEATER HOSES TO HEATER CORE THAT GOES THROUGH BACK LOWER FIRE WALL.

Nov 12, 2010 | 2002 Ford Taurus

1 Answer

1988 mazda b2200 a little hose is leaking from the thermostat housing to im guessing water pump. the hose is skinny n shorter than the hose from radiator to therm housing. what is this called?


This is going to be a thermostat bypass gose, which allows some coolant to bypass the thermostat while the engine is coming up to temperature.

Jan 08, 2010 | 1988 Mazda B2200

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