Question about BMW X7 Series

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I just got a 1988 735i was told radi ator was no good i replaced it and changed thermostat and water pump and all hoses it all looked like it was time to change idrove car home about 15 miles temp stayed alittel over half way up went to drive the next day and the main hose the one that tees off blew ahole in it its brand new why is it still running so hot as to blow a new hose soo fast! also transmission seems to be not working right its aouto matic seems like its just stuck in drive wont shift to lower gears

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  • seanba1979 Aug 25, 2010

    if its the head gasket wouldnt there be oil in the water or water in the oil ? if not the case how could i tell without removeing the head ? thanks for your response!

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Look for a blown headgasket, this would prevent the coolant from circulating properly and cause the motor to run hotter and also blow your hose because the water pump can't circulate the coolant fast enough. As far as the transmission goes you will need to replace the throttle position sensor

Posted on Aug 24, 2010

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Vehicle heats up very fast and I get no heat out of the dashboard. The upper hose is hot but the lower hose is cold after running the engine overheats. When I started it, the belt was squealing. Aft


START WITH THE BASICS. CLEAN, FULL 50/50 MIX IN SYSTEM. CHANGE THERMOSTAT. LOOK FOR TRACES OF COOLANT LOSS FROM THE WEEP HOLE IN BOTTOM OF WATER PUMP (USUALLY UNDER PULLEY). WATER PUMP DRIVE BELT OR SERPENTINE BELT MAY NEED TO BE REPLACED. ALSO MAKE SURE RADIATOR CAP IS WORKING PROPERLY.CHECK FOR LEAKS ANT WHERE ELSE IN ENGINE AREA.

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Where is the bleed valve located on a 1998 pontiac grand prix 2.8 engine? The auto parts store has never heard of a bleed valve.


Was the thermostat changed? I would suggest replacing the thermostat refill the system with new coolant and purge the air out of the system.

Mar 09, 2012 | Cars & Trucks

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My car overheats very easy.i can drive 1 exit on the highway and the temp goes up very fast. i dont know what it could be. there is always fluid in the reserve area and doesnt seem to be getting low or im...


COULD BE THERMOSTAT IF TOP RADIATOR HOSE IS NOT HOT AND BOTTOM RADIATOR HOSE GOING TO WATER PUMP IS HOT THE THERMOSTAT STICKING PARTIALLY CLOSE.IF TOP HOSE IS HOT THE RADIATOR,ENGINE BLOCK HEATER CORE NEED FLUSHING OUT.IF WATER PUMP WEEP HOLE LEAKING REPLACE WATER PUMP, FAULTY WATER PUMP WILL CAUSE ENGINE TO OVER HEAT.REPLACE RADIATOR CAP MAKE SURE YOU HAVE 50 / 50 MIX SOLUTION ANTIFREEZE AND WATER IN COOLANT SYSTEM. IF ALL LOOKS GOOD CHECK ENGINE OIL ON DIP STICK, IF OIL IN DIP STICK LOOK LIKE MILKSHAKE YOU HAVE BLOWED HEAD GASKET THAT WILL CAUSE ENGINE OVERHEATING WHILE DRIVING CAR IN SHORT DISTANCE AND ENGINE OVERHEATING.

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1 Answer

Changed water pump,thermostat, top rad. hose. still leaking leaking antifreeze from what looks like below thermostat housing. have noticed super small hose from water pump to engine. looks hard to replace....


That is called the bypass hose. It could be leaking but I'd take a closer look at the thermostat housing. If you replaced only the thermostat and not the housing, the housing may be leaking. It's a common source of coolant leaks.

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1 Answer

My exe's 98 blazer overheated on the way home last week, replaced thermostat on the side of the road, no help. She took it to a repair shop they told her they did a CO check of the coolant and she had a...


Assuming the following;
The head gaskets were replaced properly
The Water Pump was replaced properly
The Thermostat was replaced properly

There are only a few other things to check.
1) if you you remove one of the heater hoses from the engine bib during a cold filling from the radiator - it will release trapped air until you see the coolant coming out the motor side - this works great to ensure the air is out. Hook hose back up before running.(or you could leave the hose off for a second and start it to see if water gushes out - water pump check - kinda messy though)

Remember that heater water will circulate even with the thermostat is closed.

if that does not work, then you need to ensure the top hose going to the radiator warms up indicating the thermostat is opening and hot engine water is starting to dump into the radiator.

2) the radiator more than likely is clogged and needs cleaning by a radiator shop, or replacement if it is not one that can be cleaned.

Ask your son if he remembers looking into the water ports where he took off the old water pump, sometimes of the system is not flushed at proper intervals, it will sludge up the water jackets and keep water from circulating through the motor.

one last thing (gulp) That CO check is pretty accurate - and cheap. You might want to have it checked again - because the heads should have been inspected for cracks as well as pressure checked before putting them back on - especially since the motor overheated. That alone will crack the heads beyond repair - more so than not.

Let me know if you have any other questions.

Good Luck.

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My 1999 Alero must have a leak somewhere because the thermostat gauge rises every few days. I put coolant in it at least 1 a week. I had a new water pump and thermostat put on it, but it is still...


CHECK AROUND WATER PUMP AREA.AND THERMOSTAT HOUSING FOR LEAKS.THE MECHANIC WHO PUT THE WATER PUMP ON MAY FORGOT TO PUT SEALANT ON BOTH SIDES OF THE WATER PUMP GASKET CAUSING LEAKS.LOOK AROUND THERMOSTAT HOUSING FOR LEAKING.IF THERMOSTAT SEAL WAS DAMAGE DURING INSTALLATION IT WILL CAUSE LEAKING.IF ALL LOOKS GOOD CHECK FOR COOLANT LEAKS AROUND RADIATOR .CHECK RADIATOR TOP AND BOTTOM HOSES FOR LEAKS AND CHECK HEATER PIPES AND HEATER CORES HOSES FOR LEAKS.IF ALL HOSES GOOD.CHECK FOR LEAKING CORE PLUGS.

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4 Answers

Ok i have a 1992 isuzu pickup and it is overheating


You are going to need to replace you headgasket and do it soon,when that is done change the oil and the change it again after the first 2 hundred kms.

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2 Answers

1994 Honda Civic LX\overheating within 2 mile drive


Remove and raise upper hose at thermostat end and remove lower rad hose.
Fill rad with a hose and watch for flow from bottom rad hose and/ or bottom rad hose connecton.......water should fall though rad easily.
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Remove thermostat....fill thermostat housing with hose and watch for water flow at bottom rad hose.
Flush good.

Remove heater hoses.......flush back and forth until a good flow is present "With heater control set to hot" if no or poor flow....replace heater core.

Stop leak can plug everything.

Also.......not likely causing over heating....but ....at your mileage,if you do not know if the timing belt has been changed.....CHANGE IT NOW!
Water pump is optional at this mileage.

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1. Is fan turning when engine runs?
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