katz775

I hope you can help. I have a 2003 Jeep Grand Cherokee. I have been into the Jeep dealership at least 8 times in the last year for various things. The last visit, I had my radiator replaced because of a seem crack. Today, while sitting outside my son's school, the 'check gauge' light came on and I noticed the Jeep was overheating again. I called my rep from Jeep and he said the Jeep might have an air pocket. I did some reading, and that is feasible. I also read that if your heater is working, it's not an air pocket. My heater is working fine...always has. I made a list of things to ask my rep but I feel that with so many visits and the fact that my engine light still goes on and off after all this time, I'm really missing something. I know nothing about cars, so any suggestions would be great.

rangermonroe

Make sure that your electrical radiator fan is operating.

Once it is at operating temperature, pop the hood and take a look/listen when you are parked. If it goes above 210 and the fan does not operate, you have found your problem.

It can be a couple things. Obviously make sure that the connector for the fan motor is not failing (wiggle it and take note whether this makes the fan come on or not). The motor itself might be bad... I had to replace mine three times before I got one to work. Or it might be the fan relay. Not terribly expensive but a PITA to replace.

katz775

They replaced the relay and so far so good...thanks!

katz775

One thing though, the engine light never goes out! I take it in, and they fix something new every time but the light never goes out!

gmullin

take it to another dealer or an independent repair shop for another oppinion

Brando26

where is the fan relay in a 91 4.0? my electric fan isnt working

dave1123

I wasn't aware a 91 4.0 HAD an electric fan! Are you talking about the heater?

Brando26

yep, I do in my limited anyway. I just ran a positive wire from the accy slot on the fuse box through the grommet in the firewall. Always on when ignition is on. I'll switch it later. I don't go past 210 anymore. Was getting up to 230 with heater on full blast in icy weather.

rangermonroe

On my 99 it is near the passenger's side headlight. You get to it through the grill.

One of the early problems I had when I bought the car in 02 was the fan failing. I went through three and then changed the relay. I haven't had a problem with it in 5 or 6 years now.

dave1123

Hey, Ranger. Not to seem critical, but why did you change the fan 3 times before you changed the relay?

amina

I have a 2004 jgc v8 and last week, it stalled out of no where. after about 25 minutes it started and i drove it to my mechanic. they did a full diagnostic and no codes were thrown or pending. Today it overheats, the coolant levels are normal and the radiator was full was well. my fan came on so that is not the issue. any thoughts?

genesisjeep

2003 jeep grandcherokee, tapping noise comming from top of motor, then it goes away! Lazy lifters? If so can they be adjusted, 4.0 h/output?

genesisjeep

Is there a better quality brand hydralic lifter for the 4.0's, In the event I have to replace them? My jeep only has 68k on it!

rangermonroe

The fan died initially due to worn brushes. I replaced them with some that I adapted until they failed.

The replacement motor lasted a year or so. The third one died, but didn't act like the other ones, so I replaced the relay. No problems since.

I don't believe that the motors were affected by the relay, any more than a light bulb is affected by a faulty wall switch.

dave1123

Sorry man. I didn't mean anything by it. I was just curious.

"Dear Lord. Please teach me to keep my big mouth shut!"

Caution! Make certain brain is engaged before putting mouth in gear!