1991 bmw 318is 4 door 16 valve motor, runs hot and radiator cold

Thermostat temperature senecer needs to be replaced

if the temp guage is going high when engine is cold its the cable attached to the temp sensor touching the body at some point

if the engine is hot see if the radiator fan starts running if not see the cables that are attached to the fan and also see the thermostat

clean idle control valve.

you can't bleed just the radiator, you have to bleed the cooling system through the bleed holes while it's hot and pressurized and running.

two areas: bleed valve on thermostat housing, or overfill cup next to radiator.

the water pump and thermostat should have solved it. an air pocket can cause that but usually not to that degree.

don't get one of those cheap *** plastic impeller water pump for sissies. Get the metal impeller one. get a cool running thermostat and drill two 3/16" holes in it 180 degreess from each other. you may have installed the t-stat backwards.

Jennipherbrr,

1. Make sure the car is cold. Remove the radiator cap (press & turn about 1/4 turn to remove pressure in the system) Once the pressure is bled off you can remove cap and leave it rest on the filler opening.

2. Find the petcock on the radiator (the little valve attached to the radiator. You have to open/turn clockwise to drain the anti-freeze. Drain anti freeze below thermostat housing. About 1/2 to 1 gallon.

3. Have a catch basin for the anti freeze under the car. Remove upper radiator hose from radiator and thermostat housing.

4. Remove thermostat housing from engine block (usually two or three bolts in the thermostat housing). Scrap off ALL old gasket material from engine block. Double check and make sure all gasket material is removed from surface. If not the thermostat housing will leak.

5. Install new gasket with some high temp silicone. Place a couple of dabs on the thermostat housing and gasket (the silicone is used to keep the gasket in place) *MAKE SURE YOU INSTALL the thermostat the same way you took it out. Don't over tighten the thermostat housing bolts.

6. Remove the radiator cap and replace the anti freeze you removed (make sure the anti freeze is clean). Fill the radiator to the top of the filler neck and replace the radiator cap (push and turn the radiator cap to the right- like a pill bottle). Start the car and make sure the temperture guage goes up. The guage pointer should be in the middle of the guage.

7. Check the radiator reservoir for proper anti freeze level. DO NOT OPEN THE RADIATOR CAP WHEN THE CAR IS HOT!!! THE ANTI FREEZE IS HOT AND WILL BURN YOU.

Hope this helps

1)Air trapped in system
2)plugged radiator
3)collapsed heater hoses while engine is running
4) heater control valve
5) blend door motor for hot/cold (VERY COMMON)

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c

1991 Honda Accord 2.2L FI 4cyl

1. With the engine cold, drain the cooling system.
2. Disconnect the radiator hose from the thermostat housing outlet.

Fig. 1: Use a pair of pliers to compress the spring clamp, then slide it up the hose and disconnect the hose from the housing

1. Remove the thermostat housing outlet and remove the thermostat.

Fig. 2: Remove the nuts/bolts securing the thermostat housing ...



Fig. 3: ... then remove the thermostat housing



Fig. 4: Once the housing is removed, the thermostat can be removed from the engine

1. Using a putty knife, clean the gasket mounting surfaces.

If the thermostat is equipped with a pin valve, be sure to install the thermostat with the pin facing upward.

More details find in autozone.com (free register).

I hope help you with this. Good luck (remember rated this help)

could be heating control valve ( not cheap ) or could be air in the system.

possible coolant blockage in engine. Fan does not run because temp sensor is located is part of coolant that is not getting hot. Describe loud noise please. You are likely facing terminal engine failure, however, try back-flushing coolant passages on engine. This may be tricky, but you could remove thermostat and try running engine, or fabricate a rubber stopper on the end of a garden hose to put in hole where thermostat goes, remove lower radiator hose and flush water as hard as possible. A big rust flake could be blocking coolant flow. PS: have you recently had any work done on cooling system? I have seen some stupids use so much sealant when replacing a water pump that excess blocks coolant flow. Lots of luck. "The rusty one"