1994 Toyota Paseo-Blows heat when it wants to?

Question:
Hello
I have a 1994 Toyota Paseo. When I start the car and let it warm up it does like most cars do which is the temp gauge goes in the middle somewhere and remains at that point. When I turn the air on I get heat, but when I leave to drive about 5 minutes of driving the temp guage goes back down to the "cold" location. Then I get no heat. Again when I just let the car sit and idle it goes back to the middle and I have heat.
I checked the radiator while it was running and Iam seeing the flow of ant-freeze so the water pump is working. I also kept the cap off for 30 minutes thinking there might be air pockets in it but that didnt work. One person told me he thinks there might not be any thermostat in this car because how it goes back down so fast after driving. Any ideas

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Thanks

Answers:

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If you put a thermometer into the antifreeze, after the engine is warm, the temp should be around 180 degrees. There are different thermostats that may range from 160 to 195 degrees. A good all around one to have will be the 180 degree one. Good luck.

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i own a repair shop,and if there wasn't any thermostat in it it probably wouldn't heat up any at all,,but you can check this,,its a good possibility,,also make sure the coolant tank has anti freeze in it,,if its just in the radiator,,it may not have enough coolant in it,,that too will cause the same thing its doing,,other than that about all i can tell you is the water pump fins may be getting worn out a little on it,,that will cause it not to heat up much also,,good luck i hope this help,s.
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