i just replaced the thermostat in a 91 ford tempo gl and still no heat just blows cold???

125

Asked by May 25, 2013 at 05:12 PM about the 1991 Ford Tempo 4 Dr GL Sedan

Question type: Maintenance & Repair

been blowing cold for a while n just replaced thermostat and its still blowing cold what else could be the problem?

11 Answers

125

heater core?

3 of 3 people found this helpful.
125

I was told there is a switch under dash that might be the problem anyone know where it might be located?

3 of 3 people found this helpful.
68,595

Heater core might be clogged or, if you have one, a bad water control valve. This valve shuts off coolant flow through the heater core when you're not using the heater. Could be clogged or stuck shut. HTH. -Jim

1 of 1 people found this helpful.
125

with new thermostat put in it overheated twice within 60 miles could it be a faulty thermostat? gonna try putting old one back in and see what happens

125

i also have a Lincoln town car is that real enough for you? lol just tryin to come up with a quick solution for the tempo

24,995

I've had to flush plenty of heater cores months after people have used a stop-leak. If it's overheating after replacing the thermostat, it's in backward, low on coolant or the fan doesn't work. There are no switches under the dash neither is there a water control valve = coolant flows through the heater core at all times. There is also the possibility of a worn or loose water pump impeller that's not circulating coolant.

1 of 1 people found this helpful.
24,995

I forgot about the good old "rat's nest in the heater plenum"

1 of 1 people found this helpful.
68,595

Double check the thermostat. The pointy end should be up. Should also be a 195°F thermostat. If you didn't have an overheating problem before replacing the thermostat it is either defective, installed upside down, or you didn't properly re-fill the cooling system after the repair. Once the cooling system is filled run the engine to operating temperature and feel both heater hoses. Both should be hot and uncomfortable to the touch. If one is cool to the touch the heater core is clogged. HTH. - Jim

125

both hoses are hot, it was running below normal temp when I put new thermostat in and has been driven 100 plus miles sense it was put in n all the sudden just started overheating

68,595

Were you low on coolant when it overheated? If so, check the thermostat housing for leakage. Being low on coolant will cause you not to have heat (from the heater) as well. On the heat/air conditioning control panel is your temperature lever or dial vacuum, cable, or electricly operated? My '94 Escort used a cable. There is a door, inside the heater box, up under the dash that changes position when you adjust the temperature setting lever or dial. Sounds like it's not moving. If the cable or whatever is supposed to move that door is broken or disconnected there's your problem. You'll need to get under the dash & see. HTH. -Jim

10

Need pictures were is the thermostat on a 1992 ford tempo

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