No pressure in cooling system

[bradyjames]

I was losing coolant too. It turned out to be leaking from the thermostat housing. I didn’t have it bolted down tight enough and I couldn’t tell when the truck was running. The engine was too hot so the coolant was evaporating before I could see it drop, barely leaving a stain on the aluminum.

I had the pressure test done with the engine cold and saw the coolant spray out of the thermostat housing. Tightened the bolts ups, re tested, problem solved. I too, was also worried about cracked heads and bad head gaskets and my truck has never over heated either.

Now the truck is holding pressure and runs strong and steady at 175k miles.

 

[JeffL]

I tested it with a block tester and no issues there! The water keeps dripping tho, exhaust doesnt smell “off”. Call me paranoid but I really dont wanna taste that LOL

Dont taste it. E.C. is poison and causes organ damage. Now obviously a tip of your finger probably isn't going to make a difference. But it's still poison and a bad habbit.

 

[JeffL]

I tested it with a block tester and no issues there! The water keeps dripping tho, exhaust doesnt smell “off”. Call me paranoid but I really dont wanna taste that LOL

Dont taste it, that's reckless.
Look under the throttle body, there are two small coolant lines in and out that have a tendency to leak under pressure.

 

[89Suburban]

LMAO.

 

[Doubeleive]

I'm curious. Where is the heater core that serves the rear HVAC system?

the core is housed inside the vehicle behind the kick panel on the passenger rear side, it's small-just large enough for the hvac fan to push some heat out of it for the rear vents

 

[OR VietVet]

Just because it is now holding pressure does not mean there is no leak. It may only show when hot or cold. Cardboard is a great start to set under there and see what happens. Don't assume the worst yet.

 

[rockola1971]

Dont taste it. E.C. is poison and causes organ damage. Now obviously a tip of your finger probably isn't going to make a difference. But it's still poison and a bad habbit.

There is no safe amount of Ethylene Glycol for a human to ingest and once the damage is done (hours), it is irreversible and fatal.

 

[edward case]

Dont taste it, that's reckless.
Look under the throttle body, there are two small coolant lines in and out that have a tendency to leak under pressure.

thats probably why a yukon i have filled up with coolant in oil and up out of the intake. thanks gm