Have had some issues with my h2b. This forum has some very knowleagable individuals. I also trust everyones opinions here, that is why Im posting here instead of other forums.

Alright so im driving my car for about 10 minutes last night, look down and the temp is as high as it can go. Get out, let the car cool for about 10 minutes (popped hood, engine didnt seem different, and radiator cap was not hot at all. Drive for 5 minutes and temp is back up. Pullover let cool and drive for another 5. Almost home and the temp needle is all the way up. Decide to speed up because im really close to home. Once i gave it gas, the needle dropped to normal operating temperature.

So what should I do here? Im thinking my coolant levels have dropped and/or i have air in my lines. Im not able to work on the car until thursday, so Im trying to gather as much prelimianry info as possible. Im gonna drain, flush, and re-fill the coolant system, test my thermostat in boiling water, and check all grounds and temperature connections.. Anyone else have some ideas? Im hoping it is something simple that is going on.

Thanks in advance HT hybrid guys. Merry X-Mas to all

 

sounds like maybe the thermostat is getting stuck closed/open.
Maybe its getting stuck closed- hence why the car got hot. then when you got on it , it forced itself open and cooled it down.

Check it out

 

thats what im really thinking. i dont think its major, knock on wood... what would cause the thermostat to get stuck closed or open? i replaced it 5 months ago. could the smaller d series radiator play a part in this?

 

Could be the thermostat or you have air bubbles in the system.

I would bet it's just air bubbles though.

 

that was my first thought, considering the temp went back to normal when i gave it some gas. im gonna drain and flush the system and refill with new coolant, let it idle, and take her for a drive.
thanks for the suggestions guys. i know the people in this hybrid forum know what they are talking about. ive learned so much from you guys already.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hpi247 &raquo;</TD></TR><TR><TD CLASS="quote">that was my first thought, considering the temp went back to normal when i gave it some gas. im gonna drain and flush the system and refill with new coolant, let it idle, and take her for a drive.
thanks for the suggestions guys. i know the people in this hybrid forum know what they are talking about. ive learned so much from you guys already.</TD></TR></TABLE>

If you didn't replace the thermostat when you did the swap I would suggest changing it anyways. It's not an expensive part and its pretty cheap piece of mind.

Change the thermostat and then bleed the coolant. See what it does after that.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RotiEatter &raquo;</TD></TR><TR><TD CLASS="quote">Change the thermostat and then bleed the coolant. See what it does after that. </TD></TR></TABLE>

werd, and get a fail safe thermo if it fails it will stay in the open position instead of closed

 

thermostats are overrated

Like I said it most likely has a bubble, I've had this issue several times.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by skunked &raquo;</TD></TR><TR><TD CLASS="quote">thermostats are overrated </TD></TR></TABLE>

x2, not like i have a heater core anyways to use heat in the winter..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by h2b_eg8 &raquo;</TD></TR><TR><TD CLASS="quote">

x2, not like i have a heater core anyways to use heat in the winter.. </TD></TR></TABLE>

lol exactly

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by h2b_eg8 &raquo;</TD></TR><TR><TD CLASS="quote">

x2, not like i have a heater core anyways to use heat in the winter.. </TD></TR></TABLE>

I have no heater core either.

 

where can i get a fail safe thermo? sounds like a good investment.

dont worry guys, i may be joining you soon. my heater core will be next to be taken out. whats a little cold anyways?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hpi247 &raquo;</TD></TR><TR><TD CLASS="quote">where can i get a fail safe thermo?</TD></TR></TABLE>

Auto Zone I know sells them, but yea definately get all the air out.

No heater, you guys are so CraZy!!1!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hpi247 &raquo;</TD></TR><TR><TD CLASS="quote"> whats a little cold anyways?</TD></TR></TABLE>

Thats what beanies and gloves are for.


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 88ED8 &raquo;</TD></TR><TR><TD CLASS="quote">
No heater, you guys are so CraZy!!1! </TD></TR></TABLE>

mad weight loss= mad jdm show points= mad vtec, duh!

 

im gonna give autozone a call to see if i can pick up a fail safe thermo.

alright well looks like i fix the problem. drain, replaced thermostat, re filled, and bleed the coolant system. however, she still likes to idle at or a little above 1000rpm at times.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 88ED8 &raquo;</TD></TR><TR><TD CLASS="quote">

Auto Zone I know sells them, but yea definately get all the air out.

No heater, you guys are so CraZy!!1! </TD></TR></TABLE>

honestly just get a oem one. i have tried napa and it didn't even work when it was brand new

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by .Hatches. &raquo;</TD></TR><TR><TD CLASS="quote">

honestly just get a oem one. i have tried napa and it didn't even work when it was brand new</TD></TR></TABLE>

Yeah, I agree. I'm running an Advanced Auto Parts thermostat right now and it fits like crap. The OEM one is always worth the money.

 

how about the mugen one? i see they are more expensive, but are suppose to work better.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RotiEatter &raquo;</TD></TR><TR><TD CLASS="quote">

Yeah, I agree. I'm running an Advanced Auto Parts thermostat right now and it fits like crap. The OEM one is always worth the money. </TD></TR></TABLE>

yep, that's why I don't run one. Plus I really don't need it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by skunked &raquo;</TD></TR><TR><TD CLASS="quote">

yep, that's why I don't run one. Plus I really don't need it.</TD></TR></TABLE>

Drive your car on the street, trailer queen. hahaha

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RotiEatter &raquo;</TD></TR><TR><TD CLASS="quote">mad weight loss= mad jdm show points= mad vtec, duh! </TD></TR></TABLE>

my thoughts exactly....my ex loved to ride in my car in the winter

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hpi247 &raquo;</TD></TR><TR><TD CLASS="quote">how about the mugen one? i see they are more expensive, but are suppose to work better.</TD></TR></TABLE>

thermostat is only needed for the winter so you can have heat, in the summer just toss it

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by h2b_eg8 &raquo;</TD></TR><TR><TD CLASS="quote">

thermostat is only needed for the winter so you can have heat, in the summer just toss it </TD></TR></TABLE>
no difference if i get rid of the thermostat in the summer? it does make sense to me, i dont know why it would be needed.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hpi247 &raquo;</TD></TR><TR><TD CLASS="quote">
no difference if i get rid of the thermostat in the summer? it does make sense to me, i dont know why it would be needed.</TD></TR></TABLE>you need a thermostat otherwise water will just keep on flowing til all of it gets heated. Once that happens your temp. goes

 

i never had any overheating issues w/o a thermostat