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Unread 01-09-2007   #1 (permalink)
meangreen92 is offline Top Dog

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Exclamation Heater problem! No hot heat only warm in my 1992 Mustang?

I'm running a cheapo autozone radiator, a new water pump, a new heater core, and a 192º thermostat, and my heat is warm, but not hot.
It feels like a 180º 'stat did with my old radiator and waterpump. In the winter, I'd put the 192º in, and the heat would be hot.
Is an autozone radiator that good? My gauge reads on the first line.
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Unread 01-10-2007   #2 (permalink)
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I Woudl think its the thermostat. Possibly packaged incorrectly?
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Unread 01-10-2007   #3 (permalink)
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Nah, I've put it in in each of the past 3 or 4 winters, and put a 180º in for the summer.
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Unread 01-10-2007   #4 (permalink)
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Quote:
Originally Posted by meangreen92 View Post
I'm running a cheapo autozone radiator, a new water pump, a new heater core, and a 192º thermostat, and my heat is warm, but not hot.
It feels like a 180º 'stat did with my old radiator and waterpump. In the winter, I'd put the 192º in, and the heat would be hot.
Is an autozone radiator that good? My gauge reads on the first line.
Check the Thermostat, maybe it failed. If you bought a good one it probably failed open so you won't build up much heat. Even if the Autozone Radiator was the best ever at dispersing heat the thermostat should still let some heat build up.
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Unread 01-10-2007   #5 (permalink)
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Check your heater hoses and make sure they aren't plugged. I just spent a year
tracking down the same problem. Changed T-stat to 192*, New heater core, flushed system,
Verified accurate temp gauge/sending unit, New water pump and
belt. Through all these 1 at a time changes my Temp gauge and cabin heat were tellin' me
my engine was COLD! Even if I would drive it all day It wouldn't heat up. Pin-pointed it to be a
plugged heater hose. RIDICULOUS!!! Replaced that and now the old 3.3L puts out some good heat.
I actually tried 4 different T- stats, no change.
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Unread 01-29-2008   #6 (permalink)
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sounds to me like a air pocket in the heater core.i've had several fox bodies,88,2 89's,90,91 and a 92 and everytime i've changed thermostats or broke the coolant lines iwould get a air pocket.jack the car up about a foot or two in the front take the radiator cap off and let the engine run.the air should work out.
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Unread 01-29-2008   #7 (permalink)
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meangreen,

I'll put my $.02 in and say thermostat as well, though it could be a combo of the conditions everyone else is listing.

Thermostats seem like they can go bad or 'weak' in as little as a year! I have a new engine a little over a year old, and already I've replaced the thermostat just a few weeks back, and my cabin temp is now nice and toasty again.

This is the 4th thermostat in 5.5 years in this car, when I got it the cabin was barely on the warm side of frosty even on the highway.

Hey, I have that same $90 radiator from Autozone! It seems to work pretty well.

Best of luck, I know you've helped me out a lot in the past!

Michael
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Unread 01-29-2008   #8 (permalink)
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What about the restrictor valve in the upper heater hose. If it moved from its factory position could it block the flow so that the coolant would cool off in the core instead of flow steady and produce heat.
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