Question about 1997 Jeep Grand Cherokee

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Car overheat when using a/c

1997 jeep grandcheroke, car overheat when using a/c.

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First, if you have an electric fan in addition to the mechanical one, make sure it comes on when the a/c is on. Next, make sure that you have exactly 50/50 antifreeze mix (check with a cheap tester). Also check that you have the proper pound rating cap on the system. An incorrect cap will often work when not using the a/c but with the additional load, the system runs hotter and that's when the cap becomes very important. If correct, make sure that the seal on the cap is good.
Jeep radiators are marginal in size, nearly too small. If you have any leaves or bugs packed in front of the a/c condenser or between the radiator and condenser it will restrict air flow and make heat transfer inefficient. Make sure air flow is not blocked. Any internal calcification of passageways inside the radiator can do essentially the same thing (requires a good flush, sometimes replacement).
One or more of the above should help you.
good luck!!!

Posted on Jul 17, 2010


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Heater light flashing on 1997 vitara jeep not start

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I have 2005 Jeep grandCheroke V8 the dash light say Transmission over heating

i probably is.
use a pyro IR gun and check it real temperature

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Aug 20, 2013 | 2005 Jeep Grand Cherokee

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Do i need a coolant sensor to drive my jeep or will i cause iy to over heat?

The sensor wont cause it to overheat, it will cause the computer to not know the correct coolant temperature. which can lead to bad fuel mileage and drivability issues.

Sep 08, 2010 | 1997 Jeep Grand Cherokee

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I have a 1997 Jeep Grand Cherokee Laredo that the top hose that leads from the radiator to the thermostat blew the other day. I replaced the hose with no problems but the gauge in the jeep keeps indicating...

The sensor would not likely have shorted, but the sensing material may have changed due to overheating. The thermostat may also be in trouble. Replace both, then take the car to Autozone or similar business for a free computer scan, which can remove any error codes. Then drive the car to see if it resets further codes. Make sure the cooling system is topped up in both the radiator and the overflow tank. Check your other hoses for condition and replace if necessary. If the entire engine overheated, be on the lookout for antifreeze leaks around the heads and for strange misfire codes. It may have warped the heads from excess heat. Hope this helps!

Jun 06, 2010 | 1997 Jeep Grand Cherokee

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Grandcheroke wont go in to overdrive on a very rare ocassion it will also its having problems determing which gear to select say if i slow right dow to turn it will go into 2nd then 1st back into 2nd

sounds like the actuator valve is bad. these things get dirt in the diaphrm and cant open and close properly. if you can depress the diaphram by hand..then its good,and the vacuum line leading to it is cracked and needs replaced.

Apr 28, 2010 | 2001 Jeep Grand Cherokee

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My 97 jeep sometimes doesnt catch gears when i accelerate. It just revs the engine and sends the rpms up. any idea why?

That could be caused by either a pressure loss inside the transmission or a bad shift control module. Each time that happens it begins to overheat the internal clutches causing more damage so I recommend you have it checked out immediately by a reputable transmission shop.
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Apr 04, 2010 | 1997 Jeep Grand Cherokee

1 Answer

Temp guage is running up to 260 is this a thermastat problem?

Most Jeep overheats I've seen are either caused by poor radiator flow or the electric fan not coming on. You could have a malfunctioning thermostat and they are inexpensive so replacing it isn't a big deal, They become unreliable after an overheat also...another reason to replace it.
Obviously, you need to check for external leaks, oil in the coolant/ coolant in the oil or white smoke from the tail pipe (all signs of larger problems.)
Most shops use a heat sensing gun to check for cold spots on the radiator.
One clue to poor flow is if it takes a long time to fill it. To check the fan, watch it and see if it comes on when it should.
good luck

Mar 26, 2010 | 1997 Jeep Grand Cherokee

1 Answer

Jeep Grand Cherokee straight 6 1997. My information center keeps telling me my coolant sensor is bad. I replaced the coolant sensor with two different new sensors and it still keeps beeping at me. Truck...

You'll have to look around on some of the jeep forums for exact details on how to remove the VIC, but the problem is the #8 wire in a ribbon connector that holds the two VIC circuit boards together. One is the "brain", and the other is the display, and interface.They go together in the VIC "box" like a sandwhich, with the ribbon cable in between.

The factory that made the VICs use a wave soldering method, and the #8 pin (which is the coolant sensor ground pin- IIRC it's pink- will have a cold solder joint.

It takes about 15 minutes to get the VIC out of the car, and if you can solder, another 5 to fix the problem. I'd advise re-soldering all the connections, while you're in there.

OR, buy a used VIC off of someone on E-Bay. The problem with that is they might have the same affliction.

Sep 22, 2009 | 1997 Jeep Grand Cherokee

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