Z-24 coolant system
 

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<!-- BEGIN TEMPLATE: ad_showthread_firstpost_start --><!-- END TEMPLATE: ad_showthread_firstpost_start -->I have an '89 Z-24 with low miles and it runs great. 2.8L engine. However, I am having a problem in that I can't keep coolant in it. At first, I could find no leek whatsoever. Now I see it is leaking out the radiator cap. I switched the cap from the overflow to the radiator, and vice versa, but it still leaks. It is at its worst when I fill the coolant. The thermostat acts crazy once in a while where it will shoot up to 220 or so then just go back down 40 degrees in a few seconds. Any suggestions? Thank in advance. Joe

Yes, the radiator cap has a small rubber gasket ring which forms a set, dry-rots, and leaks.

Then the pressure in your system drops from @14PSI to 0PSI, and water starts to boil.

Buy a new radiator cap. Get a good name brand like Gates, Dayco, or Stant.

Careful now, it may cost ya 8$ or so...

Well rivereye, I thank you kindly for your advise. If I can buy a descent radiator cap and solve the problem, that sounds great. Once again, I appreciate it.

And Welcome to the Chevy Forums!