invisible coolant leak

[89chevsj]

Having major problems lost about 1/4 of my coolant in 100 miles. cant find a leak, and there isnt a huge cloud of exhaust has this happened to anyone? I parked it outside to see if i could get it to drip on the snow, and absolutely nothing. any ideas. Head gasket? head? or somthin else

[54 jimmy]

check you heater hose quick fitting on the back passanger side of the intake they are known for cracking and leaking down the back of the block on the hot manifolds. i had the same problem on my 4.3 s15jimmy.

[Restrorob]

Also check your passenger side carpet for wetness.

[scotts62]

Does it have a miss at all?

[bwood]

Make sure your oil level isn't rising.

[89chevsj]

I know its not he heater core. I think i will just take it in to a garage and have them find the problem. haven't checked the rising oil level thing, praying it isn't though.

[special-K]

On my 6.5TD I had a leak in one of my thermostat crossover to head gaskets and it was like the leak 54 Jimmy suggested. The coolant would run across the intake valley and down the back of the motor & bellhousing. I never saw a drop. It all burned off or blew away while driving. I would lose a gallon in 30 miles. I thought I had a major problem and it was a cheap little gasket.

[89chevsj]

ok i can see that being the problem. when i bought the truck the tempp guage went all crazy and now i never see it even reach 210. I'll check on that.

[ChevLoRay]

Cooling System Pressure Tester....find one and pump up the system. Loose hose clamps; leaking intake manifold gasket (common problem); leaking fitting for heater hose on intake (another common problem); radiator cap that won't hold pressure (bad rubber seal in the cap); all of these are common problems.

[89chevsj]

been over most havent really torn into anything much but i still need to check a few things.

[89chevsj]

Originally Posted by scotts62

Does it have a miss at all?

none whatsoever. the engine was twacked about 40k ago. so it is sound it must be somthing very simple.

twacked = heavily modded

[scotts62]

thats a new word i havent heard before.

[70BLAZERX2]

In your other thread you said at -20 it wont start..

I have seen this happen before..check the wires going to the coolant sensor..by t-stat.. make sure they are not green with corrosion..

.I had a 88 truck back in 90 come in for a no start..only when it was below 10 degrees...in Delaware.

It has green corroded wires..on the coolant sensor..Changed the plug..did nothing..I pulled up the pass carpet..yes antifreeze was there..but not from heater core..

But out of the Engine Computer itself..

.The wire had wicked antifreeze all the way up the harness..and filled the ECM with antifreeze...

Strange things do happen when it gets cold outside...

[89chevsj]

i think its just too cold. i ran some stop leak and it hasnt dropped so i think thats ok for now. however on the other post, i havent tested but i think the block heater is unhooked or broken.

[89chevsj]

Originally Posted by scotts62

Does it have a miss at all?

ya know it is cammed but i think it shakes a bit to much but maybe it's just me, but it isn't a rhymatic shake so??? i found the heater core leaking but its still dropping coolant. not much but still. it's blowing some steam from my tail pipe. but very little. i wouldn't think it should steam at all at 65 degrees. any thoughts

[89chevsj]

Originally Posted by 89chevsj

i think its just too cold. i ran some stop leak and it hasnt dropped so i think thats ok for now. however on the other post, i havent tested but i think the block heater is unhooked or broken.

block heater was done. i back traced the wire it melted and was grounding out on my header.

[89chevsj]

i should add, i can smell antifreeze near the front of the truck, but i havent in the exhaust.