Re: I have a Grand Cherokee Jeep 1994 Estate. Heater...
You may need to add coolant to the system, If it is full check to see if there is a valve on your heater hose running from the engine to the heater core. If there is, make sure the valve is in the open position when your heater is on and the engine is up to temp. If that doesnt help try flushing the sytem, you may have a plugged heater core.
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1. Check the engine thermostat (see the temp gauge). Replace thermostat if necessary. 2. Flush the cooling installation in reverse flow direction, and change the coolant. 3. Bleed correctly the cooling system. 4. Clean inside the heater core by flushing in reverse flow direction. Check for leaks. Remove and change it if necessary. 5. Check the water pump & drive belt. Replace if necessary.
either bad recirc doors or a possible bad heater core. Open the hood and when the car is warmed up to mid point on the temp gauge look on the passenger's side firewall under the hood. You will see 2 black rubber hoses running through the firewall. Feel each hose and if one of the 2 are cold then you have a bad heater core. Otherwise most likely the recirc door.
I'm guessing your engine is'nt making any tapping noise with the low oil press.
Your oil pressure sending unit is most likely the culprit.
Is your car smoking when the temp. goes up?
You engine could be air bound or thermostat could be opening too late (might need new one).
PLEASE DO NOT OPEN THE RADIATOR CAP WITH A HOT ENGINE.