First time poster, sorry for the long post, bought my first mustang, a 1967 Ford Mustang Coupe in really nice condition. I run a Nissan dealership and have some technicians who help me out working on it nights. When I bought the Mustang I had an oil leak that looked like it was coming out of the front and rear of the intake, so I talked one of the techs into helping me replace the intake gasket, and while I had it apart I wanted to do the valve cover gaskets as well. We took it apart, did the gaskets, put it back together and started it up after filling it with half antifreeze half water mixture. Started the cold motor with the cap off and it started blowing antifreeze out of the top of the radiator. Shut motor off, thought it just burped the system, filled it back up, started it again and again the antifreeze blew out this time about 2 feet high! I let it sit overnight, thinking maybe it was another air pocket, and filled it up this morning, put the cap on and started it. Let the engine run until temp came up, drove it about a mile and a half and no antifreeze being pushed out the overflow hose so i thought I had it figured out. I drove the car home tonight, 27 miles to my house, and about 6 miles in I noticed my temperature gauge running a little over 3/4, where it normally runs at 1/2. It would fluctuate up to 85% of the guage and then go back to 70-75% of the guage but never went to where it was supposed to. Had the heat on and never got any heat other than very luke warm. Got home and opened the hood, had smelled antifreeze through the heater ducts and thought head gasket, however realized the reason it was smelling like that was because it was pushing out the overflow hose and was all over the bottom of the engine compartment. I am perplexed at why after I replaced the intake gasket I cannot get the car to stop pushing antifreeze out and now it is running hotter than normal, could I still have an air bubble that is trapped? I was having zero issues before except for a small oil leak. Any help from you gurus would be greatly appreciated. On a side note I made a deal on a 1970 coupe with a 3 speed and a 6 cylinder that is pretty solid today and am starting to regret it because I cant get this one right. Lenny

 

Get the radiator cleaned out, or just replace it. Prolly want to replace the heater core too, which is a bitch and will likely result in breaking the old fiberglass core housing, which will need to be replaced.

Sounds like it's clogged up, which isn't uncommon on older cars since corrosion makes chunks of iron oxides in the iron blocks that can break off and plug **** up.

Also, did you use the cork end seals on the intake? If you did, expect oil leaks soon (though not necessarily). It should be sealed at the ends with a bead of RTV.

 

Probably knocked a chunk of junk loose that was hanging on by a hair and now it's blocking your cooling system somewhere.

 

thanks for the replys, i did use rtv, thanks to some old posts on this forum, and hopefully have fixed my oil leak issue. will give a try and replace the heater core and radiator. lenny

 

If the radiator is good quality, get it cleaned, it's hard to find good replacement stock radiators these days...most of them are **** with loose fin packing that don't work well.

 

shoot ditch the radiator and get a replacement aluminum one save the head ache

 

i doubt very much it is your radiator since it was fine before you took the intake off.

 

I'd check the oil for foam...sounds like a head gasket.

 

When you replace the intake gasket you disturb the water jacket ports on the heads, and all the crap they accumulate. Changing intake gaskets on an old engine can easily clog the radiator.