The car has done this since I brought it home.  I have removed the t stat.  no viual leaks detected from pump, rad, or hoses. Swapped exhaust ( cat was definately plugged) as it wouldnt rev with the old one and does so freely now.  all parts of the hoses and rad feel to be the same temp so I must guess the pump is working  and checked when I topped off the coolant and burped the system.  So I am now down to either I missed something or I am dead wrong with the pump or radiator.  What else should I be looking for a HG?  I am not blowing steam so would have to be completely internal with no oil water mix.

 

Mike

Didn't see any mention in your post, is the fan kicking on?

Yes.. we talking less than ten minutes from cold to shut down.

You've flushed your radiator?

I had a similar problem witt my GL just before my rebuild. Turned out to be a head gasket leak, compression blowby into the coolant.

Cool your car. Open radiator cap. Add enough coolant that you can see the surface of your coolant about halfway down the radiator cap "pipe" you add coolant to. Start engine. Watch the surface of the coolant.

Steady stream of small bubbles = head gasket compression leak into coolant channels. This builds up pressure in the coolant system, blowing the coolant into the overflow reservoir. No coolant = no cooling... engine temp rises rapidly.

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Edited July 20, 201411 yr by BirdMobile

Still could be HG.. coolant level has not diminished yet but I cant leave it running that long.  I have not flushed the rad yet it is on the to do list just to make sure.. I need to see if I have a spare water pump also and the rad I can swap from another car..  Just need to make a little more time.

My 1985 did that it was the radiator it was clogged half way up,and there was sludge in the oil pan clogging the screen. it would heat up to red line in less than 10 minutes.

Look for a large mouse nest between the a/c radiator and the engine radiator.

Look for a large mouse nest between the a/c radiator and the engine radiator.

i found one of those could not believe it was there the car never over heated after that

but most likely HG 

ive got a spare rad if ya wanna swap em for shiggles

Thanks Rob.. I borrowed from my hatch for a minute.  Waiting on a new coolant temp sensor before I throw in the towel on a waste of money.

Make sure to burp the iar pocket. IF you seem to constantly have a pocket, or t=you have bubbles rising up as she runs, supect HG faulire. You might get lucky with a heads re torque (modify shortened 17mm socket) and or a kan of k-seal. Otherwise, replacing the gasket is easy enough, slap em on and go (prob. failed from age and corrosion, old coolant)