74 maverick grabber. frustrating over heat problem!

Make sure the waterpump is not a late model reverse-flow...

 

I'll ask tomorrow what pump they put in.

 

at least check for T stat ( 180*) and a lower rad hose spring.
my car has a two speed fan. I have driven 3 miles to the interstate, go 45 miles to Summit, get off the exit and if I catch the light at the bottom of the ramp the low fan will come on for the first time for the whole trip.
two row 1" core Aluminum radiator.

 

chances are they will say "the right one". It would be nice if you could check the ticket where they got the pump and check the part number.

 

A thermostat not only regulates temperature but restricts the flow so that the coolant has time to dissipate heat. You need to determine if you have one or if it is bad.

Micah

Frank has a good point, a reverse rotation water pump would certainly be an issue.

 

When I gave it to them it had no T stat and still overheated on me.

 

I'm not sure if the 302 will overheat from lack of water restriction, but some will. Water can flow through the radiator too fast to be adequately cooled. The 351C had a brass water restrictor under the thermostat to prevent overheating. The 351M and 400 had that restriction cast in place.

 

It's not because the coolant doesn't "have time to cool". It's because cavitation and aeration can occur if the flow is too fast, and when that happens, heat is not being removed from the engine...

 

Sounds reasonable for it to be both. I haven't heard this explanation for it before, but it makes sense. It also makes sense that the water has to be in contact with the air cooled walls of the radiator tubes long enough to transfer heat.

I think this one is probably closer to the truth, as I find a couple of decent sources which say restriction from a thermostat or other flow restriction increases water pressure inside the engine. That increases the boiling point of the coolant and reduces the tendency of hot spots to form steam bubbles.

 

Why is it being run without a thermostat in the first place? Seems like an easy thing to toss in a 190.

 

It was being run without a stat because it was overheating.........

 

I have never had a 289/302 overheat like this! My 67' mustang 289 did but it had half a radiator full of rust in it. Swapped the radiator out and she runs like a top!
The head gaskets have been replaced, the water pump, radiator and as far as I know unless the shop put a t stat in it doesn't have one.

 

There are only so many causes for overheating.
I say it's either the wrong waterpump, insufficient airflow through the raditor, bad radiator cap, or someone installed a head gasket backwards. In any case, the simplest explanation that fits all the facts is most likely to be the right one...

 

Put the correct thermostat in it, by pass the heater core and see if that solves it.

 

I'm pretty sure if it was overheating with a thermostat, removed thermostat and still over heated, installing a new thermostat isn't going to help. The shop could have installed the correct stat already anyways. I'm going tomorrow to see what all has been done. It could have a blocked heater core but would that be enough to overheat the engine?

At this point I'm not sure if I want to put a 3rd engine in it.