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Leaking radiator cap

Coolant is leaking from under the radiator cap

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  • 146 Answers

2 things either the rad cap is bad and not sealing or you have a blockage in the cooling system and its building too much pressure.

Posted on Jan 04, 2015

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Posted on Jan 02, 2017

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stormbrewin
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SOURCE: Coolant filling up overflow bottle

You may need to ask AAA to put a radiator pressure tester on the resevoir bottle and pump it up to operating pressure(Pressure cap rating) and see if it over pressurises while it is running at operating temp,rev engine up and down and watch what the testers pressure readings do,it should move up and down in sync with the water pump.If the pressure keeps building i would have to believe that combustion chamber gases are over pressurising your cooling system.Also test the pressure cap is functioning within factory specs.

Posted on Oct 30, 2008

  • 323 Answers

SOURCE: 1994 dodge ram coolant leak

The bypass hose from the waterpump to the intake is leaking. It is about four inches long and is directly under the ac compressor and bracket.

Posted on Jun 09, 2009

  • 6982 Answers

SOURCE: Coolant runs down the frame rail on the passengers

First, is the operating temp normal? Have you looked carefully to see if the leak is visible after you turn the engine off after a drive? Have you lost coolant? Have you checked to make sure it is actually coolant and not condensation from the air conditioner (normal)? If you verify coolant (green), then remove the bottle and fill it with water. If it's leaking, common or not, you need to replace it. (generally inexpensive at any scrapyard)

Posted on Jul 06, 2009

01fordeb
  • 1033 Answers

SOURCE: Have 2002 Ford Escape, Where's the Radiator Cap??

This is where you fluid goes. If I were you, I would stay away from those sealants. But yes you can put the sealant in the reserve, but it;s best if you drain half the water out, pour in coolant and then re-fill. This gives it a better chance to flow throughout the system. Sometimes these sealants can cause more harm than good in the long run.

Posted on Apr 26, 2010

  • 972 Answers

SOURCE: 1995 Volvo 850 Overheating

head gasket is blown

Posted on Apr 27, 2010

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2008 grand caravan 3.3 L engine blows the plastic Y-coolant pipe twice.


WATER PUMP PULLY LOOSE, OR THERMOSTAT CLOSED CAUSING BACK PRESSURE.

Oct 17, 2016 | 2008 Dodge Grand Caravan

1 Answer

2004 Kia Sedona coolant leak front engine on driver side, leaking from under the radiator cap a tube that looks like a lil fan, what is this?


Its the hot water return pipe..but "lil fan"??
Try a new radiator cap..cheaper than a new radiator! Get one from the scrap yard guy first

Mar 18, 2014 | Kia Cars & Trucks

1 Answer

Coolant leak under car


I would begin by utilizing our shop's standard cooling system procedure.....
INSPECT COOLANT LEVEL,
TEST SPECIFIC GRAVITY,
****PRESSURE TEST SYSTEM,
****PRESSURE TEST RADIATOR/EXPANSION TANK CAP,
INSPECT DRIVE BELT(s),
****INSPECT COOLANT HOSES,
****INSPECT HEATER HOSES,
****INSPECT BYPASS/MISC. COOLANT HOSES/PIPES,
TEST THERMOSTAT OPERATION,
INSPECT RADIATOR TEMPERATURE,
INSPECT RADIATOR COOLING FAN(s)/CLUTCH OPERATION,
INSPECT CONDENSER/AUXILARY COOLING FAN(s) OPERATION(s)
INSPECT RADIATOR & CONDENSER FOR DEBRI,
OBSERVE COOLANT TEMPERATURE GAUGE OPERATION,

Jan 24, 2014 | Ford Mustang Cars & Trucks

1 Answer

Loses water from resevoir but not from radiator


So the level keeps dropping in the reservoir? If you have to keep adding coolant to the reservoir, the system is leaking or losing coolant somewhere. Have the system pressure tested to find the leak. Is the reservoir itself leaking? When the level gets low enough, first the reservoir will go dry, then the radiator level will start to drop.
Here's how the reservoir works: coolant is under pressure from the radiator cap seal. As coolant heats up from hot engine, it expands, and pressure forces the radiator cap seal up, coolant is forced into the reservoir-remember the hot mark on the reservoir? When car is shut off, coolant contracts, creating a vacuum in top of radiator. This vacuum works to suction coolant back from reservoir into the radiator, keeping the radiator topped up, and coolant should now be at the lower cold mark on the reservoir. It is a closed, sealed system. The only loss of coolant will be a very small amount of evaporation from the reservoir. If coolant level keeps dropping, there is a leak somewhere.

Nov 22, 2013 | 2000 Jeep Grand Cherokee

1 Answer

My 1997 buick park avenue, is getting hot. upper radiator hose gets under extreme pressue, stem coming from radiator hose/radiator inlet, leaks coolant only after shut off??


Normal pressure is 16 psi controlled by the radiator or coolant tank filler cap. Sometimes a cap fails to hold the proper pressure this is most noticeable at engine shut off, water and steam blow out

Aug 22, 2013 | 1997 Buick Park Avenue

1 Answer

Radiator


Look for signs of coolant leakage on the garage floor, driveway or ground under your vehicle. Check the level of coolant in the overflow reservoir or inside the radiator by removing the radiator cap. The engine must be cool before the radiator cap can be safely removed. Inspect the radiator to find where it is leaking. There may be an obvious hole or other defect that is easy to spot, such as deposits of coolant and an orange or green discoloration. You can refer this link http://www.buyautoparts.com/radiators.htm to learn about radiator.

Jun 06, 2013 | Cars & Trucks

2 Answers

Looking for the fill plug on a 200 dodge darango 4 wheel drive front punkin all i see is a vent pipe


COOLANT-ADDING ADDITIONAL
Do not remove radiator cap to add coolant to system. When adding coolant to maintain correct level, do so at coolant reserve/overflow tank. Use a 50/50 mixture of ethylene glycol antifreeze containing Alugard 340-2 y and low mineral content water.
Remove radiator cap only for testing or when refilling system after service. Removing cap unnecessarily can cause loss of coolant and allow air to enter system, which produces corrosion.

COOLANT LEVEL CHECK
The cooling system is closed and designed to maintain coolant level to top of radiator.
WARNING: DO NOT OPEN RADIATOR DRAINCOCK WITH ENGINE RUNNING OR WHILE ENGINE IS HOT AND COOLING SYSTEM IS UNDER PRESSURE.
Remove radiator cap. The coolant level should be to top of radiator. If not, and if coolant level in coolant recovery bottle is at ADD mark, check for:
  • An air leak in coolant reserve/overflow tank or its hose
  • An air leak in radiator filler neck
  • Leak in pressure cap seal to radiator filler neck
TRANSMISSION and OIL LEVEL CHECK TUBES
pctech1_27.jpg

Mar 04, 2011 | 2000 Dodge Durango

1 Answer

Antifreeze on driveway. How do I find leak? How do I refill?


to find coolant leak the coolant system needs to be under pressure.remove radiator cap ,located on top of radiator.caution engine must be cool.refill with 1/2 antifreeze ,1/2 water solution only..put radiator cap back on and let engine warm for 5 minutes.turn off engine and inspect where coolant is leaking. you can purchase a telescopic mirror at the parts store to look into places that are hard to see.to locate leak.warm engine should provide enough pressure to locate the problem

Feb 12, 2011 | 1997 Dodge Caravan

1 Answer

Radiator leaking replaced thermostat radiator startied leaking does it have to be bleed or is it A true leak


If it's pushing coolant out from under the cap, you may have another problem (head gasket or cracked cylinder head) but if the leak is anywhere else on the radiator (except hose connections) then the radiator needs to be repaired or replaced. Always re-fill coolant with the engine running and heat on high to avoid any air pockets in the system.

May 20, 2010 | 1994 Jeep Grand Cherokee

2 Answers

1992 plymouth voyager keeps overheating, i have to put nearly a half of a bottle of 50/50 in every other day. i have no visable leaking under the car or on the engine. i have replaced the radiator,...


Sometimes the pipe that runs under the intake will leak. Can you smell antifreeze burning while you are driving? Another way to tell, is to let the vehicle run with the cap off. IF you get alot of bubbles out of the radiator, you have a cracked head, or a bad head gasket which is also a fairly common problem. It will push the antifreeze out of the radiator, and cause it to overheat.

Aug 25, 2009 | 1992 Plymouth Voyager

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