[white66coupe1]

Hello,

I'm still working on my cooling system problems. Basically it runs hot and spits coolant.

Issue 1:
The car runs hot at idle and low speeds, but as soon as I get it on the highway with "major air" moving through the front it runs a lot cooler, in fact it seems to sit below the half mark. That's not bad. I do have a 1 1/2 inch fan shroud at home that I am planning on putting on but I really can't see it changing things that much.

Issue 2:
When I run the engine kinda hard the 13# rad cap doesn't hold the coolant. I put a 16# on and that helps but I almost need an 18# if they make one.

Do these sound like average cooling system problems? Do they sound related? I have a fairly "newly used" 3 row radiator.

Thanks, Greg.

 

[MachI]

The fan shroud might be enough to get you over the top. What ratio are you running ,coolant to water? How about some of the coolant additives that increase efficency(sp)?

 

[PonyDoc]

1. Is the radiator clean and flowing freely?
2. How many blades on the fan? More will pull more air.
3. What temp thermostat? A 160 will run a lot cooler, but you'll have to change back to a 180 or so for your winters.
4. 2 row or 3 row radiator?
5. ::You really don't want a higher pressure cap. It will be better to blow out the tube than blow a hose or gasket trying to relieve pressure!

 

[1966conv]

Your issue #1 is a common curse in the area I live in. You could try the shroud; but I don't think it will help enough at the lower speeds. You might try a different fan or add an electric fan.

I'm not quite understanding your issue #2, it seems to contradict your issue #1 in that you stated at highway speeds you run cool. Are you blowing out after you stop or while driving? Seems like radiator cap could be bad.

 

[JSHarvey]

A (clean) three row, a six blade fan, and a shroud should be sufficient. Get a coolant recovery tank (street rodder on e(b)ay sells a nice stainless steel one for less than $35).

A high pressure cap will just cause the next weak link to break, find the source of the problem.

I would not go to a 160 thermo, ideally you want your car to run at the same temperature all the time, that way the parts wear together. If the temperature changes a lot, then parts wear out faster because the parts expand and contract at different rates in respoinse to the different temperatures - that changes the tolerances and causes extra wear.

John Harvey

 

[RagTop]

Add the shroud, get the radiator rodded and switch over to distilled water and Red Line Water Wetter. If you haven't already changed the thermostat you should do that too.