mustang 71

[tridyman]

Own a mustang 71 which is a classic, but I have this problem since I bought it. It tends to be at high rpm on the highway and when I get home it throws up the coolant. It is usually running at high rpm. any suggestion will be appreciated.

[351wStang]

Gonna be near impossible to diagnose with such a brief description of the situation.

What do you consider high rpms?
Is the car stock?
Built motor? Tranny?
Done anything to the cooling system?

[MrPbody]

It's not unusual for latent heat to cause a surge in the cooling system when the engine is shut off. In olden times, cars didn't always have overflow tanks. Install one, and use a modern radiator cap. It will puke the coolant into the tank and siphon it back as it cools. No biggie!

Jim

[tridyman]

thank you for your reply's, but the problem is that when I get in the Highway the RPm are higher than what they should. It has a manual transmission. I change for a bigger radiator but no luck, after I get back home starts throwing up the coolant. I bought it in Ohio, it is stock with a cleveland motor. I have always thing that my transverse is making rpm go that high. It just seems that the higher MPH I go the higher rpm it gets. the thermostat does not show really over heat it is at middle reading. any feedback will appreciated. thanks

[351wStang]

Well, rpms are supposed to go up with the mph. I dont know what gear came stock in '71 but if you want to lower rpms on the highway consider lowering the rear gear (numerically). Or install an overdrive transmission.

[angus10]

You might have a blown head gasket . Check the compression.