why is the coolant not circulating

300

Asked by Jul 26, 2014 at 12:08 PM about the 1998 Chevrolet Cavalier RS Coupe

Question type: Maintenance & Repair

flushed radiator, by-passed heater core, new water pump, took out thermostat, fan comes
on but, the coolant isnt circulating. coolant leaks occasionally.

27 Answers

61,115

Radiator stopped up,or you still have a new water pump that is not working right.

6 out of 6 people think this is helpful.
105,695

Also inspect your hoses. They could be internally collapsed.

4 out of 4 people think this is helpful.
300

i ran the water hose thru the upper and lower hoses and water ran freely

4 out of 4 people think this is helpful.
148,375

T_S_T has a good point..I have bought a water pump that was bad out of box....but is it getting hot? And to by-pass heater core did you just splice the two hoses together after pulling them from firewall?

5 out of 5 people think this is helpful.
300

yes, i did just splice the heater core hoses together. Is that all bad?

2 out of 2 people think this is helpful.
300

and yes, it is getting hot!

2 out of 2 people think this is helpful.
105,695

Oh ok. But have seen hoses collapse after warming up. I would Check them when engine is warmed up. You should be able to feel if they are collapsed or not under pressure. Use caution tho they will be hot. Sorry but have to ask is your water pump belt routed correctly? Also are you positive that you got all the air out of the cooling system after replacing water pump? An air pocket can cause this also.

3 out of 3 people think this is helpful.
148,375

No, nothing wrong with that. Pondering...but still, getting hot and where is leak?

5 out of 5 people think this is helpful.
300

i did not bleed the cooling system! forgot that had to be done! my bad! the leak is toward the rear. heater core hoses im guessing. you can also hear it boiling in the resivor from not circulating.

3 out of 3 people think this is helpful.
300

and the hoses are not under pressure. i can squeeze them easily.

1 out of 1 people think this is helpful.
105,695

Ok. Get all the air out of it and you should be fine. Locate and repair the leak.

3 out of 3 people think this is helpful.
61,115

If car was running hot before all the change,s,,just my thought,s,may be bad head or blowed gasket meaning intake or head,car has been ran hot,would not hurt to check this if all the above doe,s not fix it.

3 out of 3 people think this is helpful.
105,695

That is correct TST. Good call man. That might also explain the leak.

3 out of 3 people think this is helpful.
300

how do i bleed out the air? take off resivor cap until hot?

8 out of 8 people think this is helpful.
300

do i need a compression test for head and head gasket? is there a shade tree way to do it myself?

5 out of 5 people think this is helpful.
148,375

3rd opinion...same as those guys. Water jackets in block plugged?

4 out of 4 people think this is helpful.
105,695

If in USA most auto zones will loan (deposit required but you get your money back when you return it)you what you will need to check for blown head gasket.

3 out of 3 people think this is helpful.
148,375

See what you oil looks like...if chocolate brown=big problem

3 out of 3 people think this is helpful.
300

what are water jackets?

3 out of 3 people think this is helpful.
300

oil is fine

2 out of 2 people think this is helpful.
148,375

kalikush I'll have you know you have two of the best mechanics on this site working with you..me not so much but competent marginally

4 out of 4 people think this is helpful.
148,375

Water jackets are the small passages that are between the cylinders, in the block, right next to combustion chamber, first coolant to absorb heat

3 out of 3 people think this is helpful.
300

ok fellas gonna bleed the air out now. will keep you posted thanks for the help

105,695

www.youtube.com/watch?v=9P-hEJIBpy8 --- check out this video. Most info does not pertain to you but it will show you where the bleeder valve is for getting the air out of the system. Do this first before doing any other testing. IMO anyways.

3 out of 3 people think this is helpful.
105,695

Yours may not be exactly like the one in the video but it should give you a good idea what to look for on yours.

3 out of 3 people think this is helpful.

You have a leak somewhere. Take it to the good guys @ Les Schwab to check it out for you. Problem is solved and it's prob not hard to fix. Or ask one of the guys at a local car supply store and they can direct you to a part--either you can put it on yourself or bring to Les Schwab to do it for you @ a discount:)

Had same issues. replace thermostat and water pump...was getting ready to replace Rad then heads... decided to re- bleed system slowly over two day with front of car lifted. it worked! Car cooling and running fine, although electrical fans are cycling weird gonna run an ohm test this weekend

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