I just replaced the heater core in my 2000 S10 Blazer. While reattaching the inner fender well, I noticed that there was a hose dangling from the coolant reservoir that must have come loose after getting jostled around. I'm not sure where it's supposed to go. It's the top hose that comes out near the cap, not the bottom one that goes to the radiator.
It's the overflow tube,nothing will come out unless it overheats,just heads for the ground,think there is a little plastic clip on the reservoir then to the pavement.
SOURCE: I have just replaced the radiator, thermostat, and
Hi Adrian, If you are getting water/coolant around the sump pan it sounds like you have a leaky core or welsh plug.. This is a large disk which is used to seal the holes made when the engine and cylinder head was cast.. They do corrode and leak but are very easy to replace. However, getting to them can be an issue sometimes. My advice is to have the cooling system pressure tested, this will show the leak quite easily.. You can purchase a cooling system pressure tester from your local parts store or you can take the vehicle into your local mechanic who should be able to do this test for you. If you do this yourself, NEVER exceed the pressure printed on the radiator cap and you may induce leaks due to excessive pressure. Normally, pressure testing is done at around 13 to 15 PSI..and dont forget to keep the cooling system topped up during testing as the coolant level will drop during the test.
SOURCE: Poor coolant flow through heater core. Heater core
on some GMC models there is a valve that opens when you turn on the heat inside. It is called a heater control / actuator valve, it works off engine vacuum thru hoses connected under the dash, and going to the top of the valve. Now junk and crud and old rust will get in the valve and restrict it's flow. You will have to pull the valve off and clean it, but it is best to replace it, seeing it is hard to get all the junk out of it.
It looks like a L shape pipe with a hose on top & bottom, black plastic,and a smaller line on top mounted close to the wheel well about even with the exhaust manifold on the pass side. Drain the coolant, remove the valve and see if this is the cause, lots of gunk in the one hose. It is not real hard not real easy to replace this valve. Now if your truck does not have this valve check the pipe that the hose hooks to on top of the engine, remove the hose and see if a small screw driver will go down inside or if it is stopped up. .
SOURCE: 1999 mercury grand marquis occasionally overheats,
Check the antifreeze for oil, pull your dipstick out, see if antifreeze is in oil or smells sweet or over full, sounds like you may of a bad head gasket. You can also check this by having a compression test done on the cylinders.
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