Question about 1996 Jeep Grand Cherokee

3 Answers

Engine block does not heat up

I have changed the rad, heater core, thermostat 3 times and the heater hoses and still can not get the block the heat up enough to open the thermostat. This is on a 1996 Jeep Cherokee 4litre.
Rob

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  • 6 more comments 
  • Robert Killam Feb 03, 2009

    I do not know if the thermostat is opening up or not , but if the block temp does not go past 180ish the thermostat should not open. I can not get any heat in the cab. The doors are all opening( I have a scope to look down in the vents). The heater core gets to the same temp as the block, but the temp is never any where around 200. The thermostat is a 195

  • Robert Killam Feb 03, 2009

    The rad fan is a clutch system and the thermostat seems to only fight one way. The dash gauge's reading is about the same as my laser gauge. low

  • Robert Killam Feb 04, 2009

    I tried butting and piece of cardboard in front of the rad and it did not help. I am get my reading from under cylinder 1 and off the thermostat housing. This vehical was bought last spring so there was not heat problem in the summer and this fall he hit a raccoon, so thats when we changed the rad and so on.

  • Robert Killam Feb 09, 2009

    Hi I took the rad fan off the waterpump and ran the engine. the temp came up in the shop to 215 at the thermostat housing. I then took it for a drive down the highway, it is about zero there, and the temp went down to 180 at the housing and stayed there.

  • Richard Scordino May 11, 2010

    Explain...It is impossible to not have the engine heat up.Are you damaging thermostat when installing? Are you basing this upon that you do not have heat at the heater, or that the temp gauge is not reading properly? You can read actual temps of hoses by taping a thermometer to each hose. Check to see if your heater control valve is working and that doors that control heat inside heater box are working.

  • David Shaub May 11, 2010

    What is the outside air temperature when you are checking this?

    Do you have fluid to within one inch of the radiator filler neck? Too low will give you a false cold engine reading.

  • Gary Loney
    Gary Loney May 11, 2010

    what degree thermostat did you put in it?

  • Mark Egan May 11, 2010

    What are you using to determine the stat is not opening?

    Is the engine overheating? Heat in the block opens the thermostat, and if it does not open, then the engine should overheat.

    And if overheating has occurred, then replace the thermostat. Overheated thermostats most always fail closed.

    Did you put the thermostat in correctly. They are direction sensitive.

    An engine not heating up is a good thing, and easier to fix, than one that is over heating. If you are using the dashboard temperature gauge to tell you the engine is not heating up, then have the gauge checked, and check the temperature sending unit.
    If the problem is the heater does not get hot, that's a different problem, probably having to do with the control valve.

    Reply back what symptoms you are experiencing using the above as something to joggle your thoughts.


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  • Jeep Master
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Therefore, the fan clutch is bad and should be replaced... I don't remember if I said or thought this in the beginning, or if I just thought you had checked it. Anyhow, change it and you're done!!!

Posted on Feb 09, 2009

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  • Expert
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Bypass heat control valve, and if this work's,replace control valve.

Posted on Feb 04, 2009

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  • Master
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Check the radiator fan relay. If it fails and leaves your fan running all the time, then you may never get hot.

Mine failed in my '03 Jeep Cherokee, but it failed open. Didn't make for a fun drive home. Was located behind the right headlight, and in order to access, had to drill a hole in the splash shield behind the headlight. Then plugged back up with a hole plug from the hardware store.

Oh, and the heater never really get's hot. I don't know what temp it get's to, but hot, like in my '01 Tahoe, it's not.

Posted on Feb 03, 2009

  • 2 more comments 
  • Mark Egan Feb 03, 2009

    As asked by a previous Solution Provider, what temperature is it where you are (or where the jeep is).?

  • Mark Egan Feb 03, 2009

    Have you tried blocking the radiator with cardboard?

    The basic equation here is pretty simple - engine creates heat, radiator dissipates heat.

    If engine creates too much heat, radiator over heats.

    If engine does not create enough heat, radiator doesn't have to work hard at all.

    Assuming normal operating air temperatures.

    And for the grande finale of analysis, fan clutches do fail "On". which would cause the "won't heat up" condition. And the only way to know is the cardboard test mentioned earlier (if radiator get's hot, then you know the engine is creating enough heat for the radiator heat capacity.), and replacing the clutch (the only thing that you have not yet replaced.
    And "On" does not necessarily mean the fan locks up, so rotation by hand does not mean the clutch is good (after all, it is a "clutch".).

    Reply your thoughts.


  • Mark Egan Feb 04, 2009

    OK. Again, what is the air temperature where you are at?

    I am really leaning toward this being a fan clutch problem. You need to read up on how they work, and you'll understand what I am talking about. Besides, you have already spent a bunch of money and time on things that didn't fix it, a fan clutch isn't going to cost that much more.

    You might find some raccoon parts to blame. :-)


  • Mark Egan Feb 10, 2009

    Sounds like Thundergod and I are on to something. Let us know what you find.

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