no heat = headgasket?
gots me a '92 Cougie 3.8l with issues. The heater is very tempermental. Before it worked sometimes, and sometimes it didn't. Match that with a temperature gauge that will swing from cold to near boiling in a period of five seconds, then drop back down just as quick. Now my heater will barely work period. I changed the thermostat with a Ford unit already and that didn't help. Then I thought it was a coolant leak. Got that fixed up (one of the pipes going to the water pump had a small leak), and still problems. Which is where I'm at now.
If I bleed and refill the coolant it will work fine for a day and then the same problems will come up.
My mechanic thinks it might be the headgasket which has me worried. Note, he wishes it isn't as much as me because he hates doing the damn things.
I should note though that my car is running fine now, I don't smell gas in either the radiator or the overflow tank. Will do an oil change in a few days, but I don't think I'll see anything in there. Smoke is only as much as you would expect in -20-30C weather, and I don't smell any coolant coming out of the exhaust.
A few last things, when the temp. gauge says the motor is near boiling, the motor is still cold most of the time and it has never overheated on me. Also today, on my way to work whenever I tried the heat I smelled coolant coming from the vents about two times, out of say ten that is.