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Cracked Head

I have an 1984 gmc sierra 3500 pickup/350 propane. The water in the overflow is full and my radiator doesn't seem to want to take the fluid back from the reservoir "even though the fluid is very low in my rad. I think it might be a cracked cylinder head "propane has cracked the heads in the past". I took it to a radiator shop and he tested my coolant for hydro carbons, and found none. How accurate are those testers, and does this mean I probably don't have a crack? I'm going to change my radiator cap, see if that helps. Any help would be appreciated. It passed the emmisions test last week. Can it pass with a cracked head. Don't know if I'm losing fluid in to the cylinder or just in to the overflow.

Reply to
bob
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Have you checked the overflow hose for cracks? If cracked, it will suck air instead of coolant. Dave

Reply to
Dave Brower

If the head is cracked leaking exhaust to the coolant side it will cause coolant to be blown out there will be a noticeable coolant loss from over flow tank. I've used leak detection systems to check for gases in the coolant the good ones are accurate.

Jim .J

Reply to
Sa. J

Replaced the radiator cap yet? how about checking the hose for blockage or cracks?

Reply to
Steve W.

Yes I did change the cap, and it worked. Got my heat back, and water is now transferring back and forth like it should. Thanks for your help...

Reply to
bob

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