I have a 1991 jeep cherokee sport with a 4.0 high output engine i put a new radarator new head gasket new head new water pump and new cluch fan also new therostate i can,t get the therostat housing to seal i put a new gasket and form-a-gasket what now

Several possibilities, including blockage in coolant tubes of radiator, damaged or slipping impeller on water pump, blockage of air flow through radiator, inoperative radiator fan(s), damaged head or head gasket...

Does the radiator fan come on? If not, problem could be bad temp sensor or fan motor or wiring.

You need to do a compression check on #5. You could have blown the head gasket again.

Clutch Fan are known to fail over time, but I wold not rule out the radiator. The small passages inside the radiator will clog due to age. You did not mention how many miles are on the Jeep or if the Aux fan is kicking on.

If you put the thermostat in correctly (spring towards the engine) that should be OK. Likely if the water pump wasn't leaking or had a bad bearing, you wasted your $ on that.
If you re-filled it and did not have the heater on high heat, you may have some trapped air in there. But, still overheating says another thing. If you have a blown head gasket, it can pump compression into the cooling system and drive the coolant from the core. It will also overheat. You can have that tested at most any decent shop that will do a hydrocarbon test to find that.I think someone makes a chemical test kit for that but not sure if it's very expensive or not. White smoke from tailpipe will also be an indicator as will be any coolant in the engine oil or coolant on one or more spark plugs. If it turns out that it has a head gasket problem don't stop looking for problems as often a faulty fan or obstructed radiator can cause the initial overheat that caused the gasket to fail.

Pull the alternator brackets and front engine brackets off until you get to the water pump. You will also need to remove the fan shroud and then the fan. Remove the water pump and then you will see an aluminum cover and that will be your timing cover. remove the cover and clean all the gasket off the engine and the cover. use a razor blade, and make sure there in no oil or grease on the parts where the gasket lies. Put your gasket on, bolt the cover back on with the new gasket and repeat the teardown process in reverse.

i change the radator get a new one it fit the problem

Hi there Ramarob

Here's a step by step to remove and replace the water pump on your Cherokee.

Be advised, all 4.0L engines, some 2.8L engines and some 4.2L engines have a reverse rotating water pump. You can ID these from the word REVERSE or REV imprinted or cast on the housing and/or fan. There will also be an 'R' stamped into the impellor.

Make sure your replacement pump is the correct type, If not, expect some major turmoil.

The procedure:
1. Remove negative battery cable
2. Open radiator valve - drain cooling system
3. Remove cooling fan and shroud
4. Remove belts (see my tip on serpentine belts if needed)
5. Remove water pump pulley from hub
6. Remove hoses from water pump
7. Remove accessory brackets from the water pump.
When removing the P/S pump and/or AC compressor, leave the hoses attached and move them out of the way.
8 . Remove the remaining bolts and detach the water pump from the engine. The bolts are three different lengths. Make note of where they came from.
9. Compare the new and old pumps. Make sure they match.
10. Scrape off the old gasket material.
11. Apply a thin continuous line of RTV High Temp sealant to the water pump side of the gasket.
12. Put a couple bolts through the pump to hold the gasket in place and mount the gasket.
13. Apply Another coat to the other side of the gasket.
14. Attach the pump to the engine. Screw the bolts in finger tight.
15. Attach the remaining bolts.
16. Tighten them up in 1/4 turn increments.
17. Re-attach all the stuff you removed
18. Refill the coolant, adjust belt tension.
19. Run the engine and check for leaks.

Hope this is very helpful
Mike

Sounds like the starter. If you remove the starter and take it to autozone or advance auto parts, they will test it for free.

 For your 1991 Jeep Cherokee 2WD 4.0L MFI :
  Foot pounds (Final torque) 

  Note:
  Torque sequence ------------------  
  front    | 12  8   4   1   5   9  13 | 
  of | | 
  engine | 11  7   3   2   6   10 14 | 
  ------------------  
Final torque must be reached in 3 equal steps  
  Step 1: torque all bolts (except bolt 11)  
  to 110 Ft/Lbs  
  Step 2: torque bolt 11 to 100 Ft/Lbs  
Recheck final torque in sequence  

your head gasket is gone....this will require a new gasket and the head to be skimmed.....dont be wasting money on anthin else