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Unread 02-23-2011, 02:25 PM   #1
Bnabb
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Temp Guage and No Heat

I've searched and can't find the answer that I'm looking for so here goes:

My '93 2.5L was running and driving fine then I shut it off and went to drive it the next morning and my temp guage stayed on 100 the whole drive to work and when I went to turn my heat on there was no heat. I took my guages off today and looked and it was all surprisingly clean.

This is the sensor for the computer correct?



Is this the sensor for the temp guage?



Most things I have read said that it has only 1 wire and this one has 2?

Anything would be helpful, I would like my heat back

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Unread 02-23-2011, 03:31 PM   #2
Bnabb
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My question, I guess, is what do I need to replace?
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Unread 02-23-2011, 03:34 PM   #3
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Sounds like your thermostat is stuck open.

A bad gauge could never make your heater not work. If there are 2 problems indicating that your engine isn't warm enough why dig through all that wiring?

I'd replace the thermostat and see if that fixes it.
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Unread 02-23-2011, 03:37 PM   #4
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I would also say to replace the thermostat for the above reasons.
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Unread 02-23-2011, 03:38 PM   #5
Bnabb
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If my thermostat was stuck open wouldn't that make the antifreeze constantly run through my heater core? Neither one of my heater hoses are warm going into the heater core.
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Unread 02-23-2011, 03:43 PM   #6
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Quote:
Originally Posted by Bnabb View Post
If my thermostat was stuck open wouldn't that make the antifreeze constantly run through my heater core? Neither one of my heater hoses are warm going into the heater core.

If the thermostat was stuck open coolant would be constantly running through your radiator which would cool it all the time so it would never get up to temp which would result in the coolant not getting hot enough to heat your Jeep.
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Unread 02-23-2011, 03:49 PM   #7
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Sounds like thermostat is stuck.
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Unread 02-23-2011, 03:52 PM   #8
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Im gonna go out on a limb here and say your thermostat is stuck open.
Also looks like its time to replace that vaccume hose in the top pic.
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Unread 02-23-2011, 03:53 PM   #9
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Quote:
Originally Posted by Zombi View Post
Im gonna go out on a limb here and say your thermostat is stuck open.
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Unread 02-23-2011, 03:55 PM   #10
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Quote:
Originally Posted by TheNewbie View Post
If the thermostat was stuck open coolant would be constantly running through your radiator which would cool it all the time so it would never get up to temp which would result in the coolant not getting hot enough to heat your Jeep.
And the reverse is true as well, if it won't cool down its stuck closed.
I just got a new T-stat today because the engine temp & inside heat were fluctuating, nothing else seems to be wrong and its a cheap part to replace.
If you do replace the stat make sure you look up the correct degree setting, some people will drop a 160* stat when it should be 180 or 210.
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Unread 02-23-2011, 05:20 PM   #11
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Quote:
Originally Posted by GEARHED

And the reverse is true as well, if it won't cool down its stuck closed.
I just got a new T-stat today because the engine temp & inside heat were fluctuating, nothing else seems to be wrong and its a cheap part to replace.
If you do replace the stat make sure you look up the correct degree setting, some people will drop a 160* stat when it should be 180 or 210.
It should use a 195* degree thermostat. I agree, use the correct one.

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Unread 02-23-2011, 08:38 PM   #12
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Quote:
Originally Posted by Zombi View Post
Im gonna go out on a limb here and say your thermostat is stuck open.
Also looks like its time to replace that vaccume hose in the top pic.
Stupid question but which one is the vacuum hose?

And what would the problem be that is causing my temp guage to not do anything? Or should the thermostat change fix that?

Thanks again guys
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Unread 02-23-2011, 08:41 PM   #13
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Originally Posted by Bnabb View Post
Stupid question but which one is the vacuum hose?

And what would the problem be that is causing my temp guage to not do anything? Or should the thermostat change fix that?

Thanks again guys
Your temp gauge won't read over 100 IF THE TEMP IS NOT OVER 100.

We're saying that if your heat is out too don't you think that it's more probable that your engine isn't heating up than it is that your heater broke at the same time as your gauge?

Plus you said it yourself that the hoses to the heater core aren't hot, and the cheapest, easiest thing to fix in your list of "possible" problems is the thermostat anyway.

Just do it. You'll be glad you did.


And as far as the vacuum hose, I think he's referring to the decayed looking one running from the valve cover to the intake. But the decayed part is just a rubber coating. The hard line inside is probably fine. But it's never a bad idea to take them off and inspect them.
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Unread 02-23-2011, 08:54 PM   #14
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Quote:
Originally Posted by Bnabb View Post
Stupid question but which one is the vacuum hose?

And what would the problem be that is causing my temp guage to not do anything? Or should the thermostat change fix that?

Thanks again guys
Change whats behind the thermostat housing (the thermostat itself), circled in green and your problem will be solved.



Trust us, whats the worst that can happen

Thermostats are cheap... few dollars and you'll have heat again (and your gauge will work fine).
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Unread 02-23-2011, 08:55 PM   #15
Bnabb
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I know that my engine is heating up, I know that not the problem but is it even possible for an engine to run under 100 on a warm day? shouldn't it move even at least a little bit? Unless that sensor is out?
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