1994 V6 Mustang Coupe - Possible thermostat problem, Please help!
I own a 1994 V6 Manual Mustang Coupe. I have been using the heater with no problems, then one day recently I noticed the heater didnt seem to warm up the car as it had in the past. Then I noticed it would intermittently blow cold air. I took note of when, and noticed it only blew hot air when driving over 50 Mph or so. Today, when I tried to use the heater it not only just blew cold air, but the car started to overheat. The temperature gauge fluctuated between cold and hot. When it approached the red line either the fan would kick on or I would have to stop for a few minutes. I had the radiator replaced this summer and as far as know the coolant level is fine. But I won't be able to check till in the morning. I understand that this is most likely a problem with the thermostat, possibly the water pump, less likely the heater core. I would like some advice and/or insight into this matter. Thanks a bunch.