engine overheating?!

[jdmjosh]

Hey guys, good to see another Justy forum around.

I have a 95 Justy GL EFI. My heater only blew warm air last winter, so I figured i'd give it a tune up.

Pulled all three coolant temp sensors from the intake manifold, pulled the thermostat and the blower motor resistor.

2 of the three sensors I had can't be found, and the one that they did find, didn't fit so I put all the old ones back in.

The thermostat they sold me didn't seem to open, so I put the old one back in.

I'm still waiting on the resistor..

Anyway, after putting the thermostat in, the engine overheats.. the coolant doesn't seem to be moving through the engine at all.. what would cause this? My water pump doesn't seem to be leaking...

Any ideas?

Thanks in advance, Josh

[justyfied]

Nov 16, 2011 13:40:10 GMT -4 jdmjosh said:

Hey guys, good to see another Justy forum around.

I have a 95 Justy GL EFI. My heater only blew warm air last winter, so I figured i'd give it a tune up.

Pulled all three coolant temp sensors from the intake manifold, pulled the thermostat and the blower motor resistor.

2 of the three sensors I had can't be found, and the one that they did find, didn't fit so I put all the old ones back in.

The thermostat they sold me didn't seem to open, so I put the old one back in.

I'm still waiting on the resistor..

Anyway, after putting the thermostat in, the engine overheats.. the coolant doesn't seem to be moving through the engine at all.. what would cause this? My water pump doesn't seem to be leaking...

Any ideas?

Thanks in advance, Josh

Josh,
Again welcome, Good to have another Justy owner. When you say you have a 95 Justy that tells me that you are in Canada. Canada is the only country that has any 95 "Classic" Style Justy cars.
About diagnosing your problem:
You pulled the sensors and replaced them back due to them being unavailable. You don't need the sensors to tell you that it is overheating so you look at the thermostat.
So say you reinstalled the old original one and the problem persists.
Then since it was not over heating with that thermostat before it is not the problem either.
Do not take this personal, but whenever diagnosing problems that pop up after you or someone else has been poking around. It is best to question the methods of repair not the parts in the repair first.

In a nut shell Iam saying what could you have done in the process of changing things back and forth that would result in sudden loss of cooling.
The first suggestion I have is to look at if you used silicone as a gasket when mounting the thermostat again. If so it is fairly common to use too much. Then when the parts are tighten up the excess gets squeezed into the working of the engine. What if a chunk or silicone is stuck in the water pump restricting it?

I would suggest you purchase a new water pump and replace it.

i

[ultra_porcupine]

did you put the thermostat in backwards? if your heater core is pluged your thermostat will no open