DevilsDogjeeper

I have a 1994 cherokee country my jeep has always ran just under 210. Few weeks ago it started running really hot and getting there really fast. I have replaced my thermostate down to a 160. New mechanical fan clutch. I know the coolent is flowing because I still have heat. Plus my budy is giving me another electic fan. I was wondering what could be causing my engine to run so hot other then the Florida heat.

SteveMongr

Could be restricted flow through radiator and/or engine.
Fins of condenser and radiator could be clogged with debris/bugs.
Water pump blades worn out.
I would flush the system and see what comes out, then make a decision.

When was the cooling system last overhauled with new radiator, hoses and new water pump?

The 160 t-stat will not help heat issues and can cause jeep to run inefficiently.

Fred/N0AZZ

^What Steve said, but I would just do a super flush (don't forget the heater core) several times and then just go ahead and replace all of those things^


Yeah never use a thermostat with that low of a temp not good!

DevilsDogjeeper

I believe it has not been overhauled to my knowledge. I'm the 3rd owner.
I'll flush the system and see what happens.
Should I go to a 185 t-stat?

SteveMongr

195 t-stat.
Cooling system condition unknown and is acting up, getting worse? Replace it!
Eyeballing flow through radiator can be deceptive. The small passages get clogged with silt and coolant just flows across the top of radiator.
Once the passages are clogged, normal flush will not remove it all. Best to replace the radiator. Plan on it. Stock 2-row radiator from most parts stores works well and has a warranty.
Also replace hoses, water pump and serpentine belt.

DevilsDogjeeper

Alright good to go. I will make it happen. Thank you again for the advice!

SteveMongr

Couple tidbits for ya.
Heating up at idle is a sign of poor air circulation (fan clutch, debris in fins).
Heating up while highway driving is a sign of poor coolant flow..

When the radiator is removed, use compressed air to blow out condenser fins, from the inside of engine bay outwards. Not too much pressure, like 75 psi, and not too close, do not want to bend or damage the fins. You may be surprised what comes out.

peligro113

how about checking the easy stuff first...did you check the gauge or sending unit? have you checked the actual temperature with a infared thermometer?