Question about 1995 Honda Passport
My honda passport ran great when i test drove it. now its overheating. i changed the coil packs, did a tune up with the wires, and put a thermostat in it because the man that sold it to me told me it didn't have one. after i picked it up it wouldn't go faster than 5 miles an hour and that's pushing the gas to the floor. since i changed what i did, its not overheating but the top hose in my radiator is hot while the bottom hose and radiator is cold plus it has an air bubble? what do i do?
It sounds like it could be a head gasket or some migration of exhaust gas into your water jackets, do a head gasket leak test and that will determine what direction you take next, make sure the top hose has been bled of all air first
Posted on Jul 14, 2013
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Posted on Jan 02, 2017
is the temp gauge getting hot as you drive the vehicle or does it remain at a constant temp? if no problem in coolant temp getting too hot (and overheating), then it should not be an issue.
you're sure radiator is filled with 50/50 mix of coolant & water to the top of the cap? if there's an air bubble trapped it could cause a problem. some cars have to be "burped" after refilling with new antifreeze.
if, however, its overheating, then i believe your radiator may be clogged preventing the coolant to flow across the radiator fins and cool properly.
try this. warm the car up (not the point of overheating, but hot enough for the t-stat to open), turn it off, make sure the electric fan is off (or unplug it is so equipped), then run your hand across the radiator. it should feel warm. if you feel cold spots, then that portion of the radiator is clogged preventing flow. new radiator is now in order.
hopefully its only a clogged radiator and not a clogged engine block.
hope this helped.
Posted on Feb 22, 2009
When the car is completely cool,check the electric fan(s) for smooth rotation.
Clean/check/change the thermo sensor,contact and wire.
Excavate air pocket in coolant system / check for head gasket leak
This test will kill two birds with one stone.
MAKE SURE THE COOLANT SYSTEM and ENGINE IS COLD!
RAN THIS TEST IN A WELL VENTILATED AREA ONLY!
You will spill some coolant during this air pocket purge test.......BE KIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!
Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .
Top of the coolant reserve tank
Let it ran for 10-15 minutes.
Monitor for air pockets escaping from coolant reserve tank.
Small amount of bubbles is OK at 1-5 minute mark
After the thermostat open up (after 195 F warm up) at
5-12 minute mark or after high idle you should see less bubbles.
If you do not see any in rush of bubbles then your thermostat may be partially stuck or rusted badly inside the thermostat hosing.
Give the thermostat host few gentle taps.
If you see larger bubbles surfacing after 15 minutes then should do a hydrocarbon (HC) dye test to test for potential head gasket leak.
Let engine cold down and top off coolant reserve tank.
Start monitor for coolant lost
A coolant flush is require every 2 years or 24,000 miles.
I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.
Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.
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Posted on Dec 05, 2009
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