Question about 1999 GMC Jimmy

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Engine is running hot .light comes on and will goes up to 200 degrees. I put a new rad. cap on and that didn't help. Hoses seem to be all right. It shut down on me sat. and I had to have it towed home. could it be the thermostat.

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Yes,it could be...Try replacing your thermostat.

Posted on Oct 19, 2010

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1 Answer

Why am i overheating


anon post
no engines option state (no size and cyl. counts)
is the dash toy gauge working right or fibbing.?
i never trust one, i use the nand IR pyro gun for 15 bucks.
the gun can in fact tell you if any RAD tubes are clogged
thermostat not in backwards? and bleed hole up hill?

a bad rad tube will read hot on the feed end and about 50 degrees
less on the other end, if not the tube is clogged. easy huh,
running 50% coolant
no coolant in the engine oil?
no oil in the top of rad neck, or carbon chucks.
signs:?
not getting so hot it pings?
steam out tail pipe end on hot motor and stinks sweet (glycol sweet)?
rad cap works and holds 14psi.? the big rad hoses.when squeezed
will reflect that 14 pound per square inch. super easy test.
no leaks.
no leaks on passengers toes, or to ground or to engine oil pan(milky)
if all that pans out the pump is bad. or belt loose.

one thing not stated.
does it overheat parked and running fast. or both.??????
if only parked the fans are failing.
all engines over heat parked, and in FACT that is the FSM '
test, doing exactly that. you get it warm, then parked
it starts to get hot. then the fans come on,
if not , fix fan(s)
summer answer, not in winter in Alaska.... different answers there.

are the air paths from the grill to the back side of RAD
clean not all parked in dirt bugs and what not?
if the fan cant suck, the RAD will overheat. for sures.




Sep 05, 2014 | 1999 Jeep Wrangler

1 Answer

After it runs for awhile it starts leaking antifreeze coolant


If you can't see any obvious leaks around rubber hoses or radiator, it could be leaking though the engine block gasket into engine. Or even escaping through the rad cap when hot, leaking as steam slowly. Try putting a new radiator cap on (rad cap). As a quick fix, put Radweld solution into coolant. Any auto shop has it.

Apr 05, 2014 | 1993 Buick Park Avenue

2 Answers

Little or no heat


Is both heater hoses hot? Could need radiator and heater core flush. Water pump propellers could be detoriated. I have seen this on vehicles before. Just some ideas to look at.

Jan 01, 2014 | 1995 Dodge Ram 2500

1 Answer

My 97, 5.2 runs 200 without AC, if I turn on AC, it goes to 220. Replaced clutch fan, thermostat, water pump, and new cap. Backflushed block and radiator. No results. Why so hot? Only 92K on unit.


dodges run like that. if your worried put a 180 degree thermostat in. maybe even a 160 . wont hurt engine or fuel mileage . my 99 dodge ram 1500 sport runs fine with 160 degree one. hope it helped , good luck

Oct 03, 2013 | 1997 Dodge Ram 1500 Club Cab

1 Answer

The van is overheating. I have replaced the relay switch, removed the thermostat, the water pump is working fine..but it has 2 fans. one, the one on the passenger side doesn't come on. I have no idea...


First of all, the passenger side fan is for AC, and should come on when AC is on or defrost. Secondly, if you didn't have the heater on when you refilled the cooling system after thermostat was changed, it may just be an airlock. Run engine from cool with heater on and let it run with cap off and top it up as it goes down. Let it run long enough for rad fan to come on and go off 2 or 3 times, and keep an eye on rad level and top it up a couple of inches from top each time it goes down. Then put rad cap back on and try it. Let me know if that helps.

Aug 05, 2011 | 1998 Dodge Grand Caravan

1 Answer

My 84 cressida is overheating (has new radiator cap new thermostat & gasket have flushed the cooling system replaced the fan clutch with another {not new...used} new antifreeze too) has no leaks no...


It really seems like you'll need a radiator. The rad can appear to have good flow because even if it's plugged, coolant will bypass the cooling fins. If you can get at it, try putting your hand on the surface of the radiator when the engine is hot but not running. The rad will fell relatively cool across the surface if it's bad...hot if coolant is flowing through the core. Those hand-held laser thermometers are handy for doing this as well.

Jun 25, 2010 | 1989 Toyota Cressida

1 Answer

I have a 84 351 windsor that runs way to hot i put


seems to me that you could have an air lock, try loosening the rad cap slightly and run car until fans kicks in, squeeze upper rad hose a few times to push any air out. Careful with hot hoses. see if this helps.

Apr 27, 2010 | 1991 Ford Mustang

1 Answer

Coolant temp sensor located on a 2004 dodge ram 1500 4.7


YOUR ENGINE OPERATING RATING TEMPERATURE SUPPOSE TO BE 190 TO 200 DEGREES. IF COOLANT SENSOR DEGREES IS SHOWING 190 OR 200 DEGREES IT WORKING.THAT RIGHT.IF ITS SHOWING 60 OR 80 DEGREES IT FAULTY. AND ENGINE WILL RUN POORLY.

Jul 30, 2009 | 2004 Dodge Ram 1500

1 Answer

Coolant leaks


That's probably coming out of your coolant return bottle. With rad cap off & engine cool, look at your level in the rad, if necessary top it up to an inch or so from top. Start engine, turn heater(not defrost) on and let it run until up to normal operating temperature. Keep an eye on temperature gauge & rad level. When it's at normal, watch for good flow going through rad when thermostat opens. after flow slows down,(thermostat closes) top it up if needed. If you watch 2 or 3 times for flow, and gauge doesn't go over normal, then put cap back on, then fill bottle only to mark for warm or hot engine, with coolant. If gauge goes up over normal from there, replace thermostat, and I'd get a new rad cap too. If that has electric cooling fan, make sure it comes on shortly after you see thermostat open & coolant flowing through rad.

Apr 21, 2009 | 1998 Dodge Ram 1500 4WD

2 Answers

2002 V.W. Jetta 2.0 liter overheat


turn your heater on to max heat and high fan. then see if you can feel the hoses on the firewall for heat they should be hot. make sure that the fan unit on the radiatoris working if the upper radiator hose is hot the fans should be running if they are not that means that either the relay is bad the thermo sensor is bad or the fan unit is shot... please rate the solution..........thanks

Sep 24, 2008 | 2002 Volkswagen Jetta TDI

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