NO HEAT - ZR-1 Net Registry Forums

zr1343 · 12-31-2009

I was reading some of the other posts and I believe I have the dredded air bubble in the system. I drove her in 30 to 35 degree weather and I had little to no heat. Fans work , dampers move, engine temps appear to be OK, and the heater controls are not throwing codes as per the manual. I have faintly warm air when I first turn the system on but it quickly cools to ambient when moving. The inlet and outlet lines to the heater core feel hot.
How do I get the air out? I saw a reference to ZR1 Specialist sight but I can't seem to open the article. I have seen something in the past about jacking up the right side of the car when filling. Does anyone know if jacking the car up on the right side while running will clear the bubble on a filled system or do I need to do a drain and refill?

12-31-2009

Quote:

Originally Posted by zr1343

I was reading some of the other posts and I believe I have the dredded air bubble in the system. I drove her in 30 to 35 degree weather and I had little to no heat. Fans work , dampers move, engine temps appear to be OK, and the heater controls are not throwing codes as per the manual. I have faintly warm air when I first turn the system on but it quickly cools to ambient when moving. The inlet and outlet lines to the heater core feel hot.
How do I get the air out? I saw a reference to ZR1 Specialist sight but I can't seem to open the article. I have seen something in the past about jacking up the right side of the car when filling. Does anyone know if jacking the car up on the right side while running will clear the bubble on a filled system or do I need to do a drain and refill?

Marc's site seems to be having problem with the articles. I'll send you the written instructions with pictures to your email.

zr1343 · 01-01-2010

Quote:

Originally Posted by HAWAIIZR-1

Marc's site seems to be having problem with the articles. I'll send you the written instructions with pictures to your email.

Thats exactly what I was looking for. Thanks.

jonszr1 · 01-02-2010

after a couple of heat cycles your system should cycle out the air . the only time i have ever had a problem is when i have had some kinda leak in the system .after the car cooled down and you took off the cap was the level all the way up????/ if not you might pressure test the system and see if it holds pressure .

gbrtng · 01-03-2010

You need a good "radiator" cap for the heat cycles to fill the system properly - and keep the white tank supplied with coolant.

jonszr1 · 01-03-2010

thanx for the rad cap addition i forgot about that one

zr1343 · 01-03-2010

Quote:

Originally Posted by Dynomite

I think there are only three articles that are not functioning on Marc's web site .....one is the coolant installation.

So...did the original Marc Haibeck method of coolant installation work for you

What are the main points of Marc's method of replacing coolant

The reason I am asking is that maybe Marc is altering those methods.

It seems I have a plugged heater core. Hot line in and cool or slightly warm on the short u tube out to tank. I tried parking the car on an extreme angle with the passenger side raised very high. No bubbles during warm up with cap removed.
I believe she is full and no bubbles are in it. any one had any luck back flushing heater cores? It looks like I have a project.

jonszr1 · 01-04-2010

i have to replace the heater core on my 90, its leakin . looks like you have to remove everything in the dash to get it out .? anyone done this project ?and have any help on what probs crop up ??????

01-04-2010

Quote:

Originally Posted by zr1343

Any one had any luck back flushing heater cores? It looks like I have a project.

You can flush it, you need to cycle water through the inlet and outlet back and forth. Don't get your hopes up on that helping. Also keep the pressure low as the units were not designed to hold a lot.

phrogs · 01-04-2010

Its a job from hell but it can be done.
The heater core sits inside of a black plastic shell and you will have to remove the dash to get to it.

12-31-2009	#1
zr1343 Join Date: Jun 2008 Location: South Boston ,Va Posts: 10	NO HEAT I was reading some of the other posts and I believe I have the dredded air bubble in the system. I drove her in 30 to 35 degree weather and I had little to no heat. Fans work , dampers move, engine temps appear to be OK, and the heater controls are not throwing codes as per the manual. I have faintly warm air when I first turn the system on but it quickly cools to ambient when moving. The inlet and outlet lines to the heater core feel hot. How do I get the air out? I saw a reference to ZR1 Specialist sight but I can't seem to open the article. I have seen something in the past about jacking up the right side of the car when filling. Does anyone know if jacking the car up on the right side while running will clear the bubble on a filled system or do I need to do a drain and refill?

01-02-2010	#4
jonszr1 Join Date: Sep 2006 Location: lone pine and mammoth lakes Posts: 1,406	Re: NO HEAT after a couple of heat cycles your system should cycle out the air . the only time i have ever had a problem is when i have had some kinda leak in the system .after the car cooled down and you took off the cap was the level all the way up????/ if not you might pressure test the system and see if it holds pressure .

01-03-2010	#5
gbrtng Join Date: Feb 2006 Location: San Antonio area Posts: 1,183	Re: NO HEAT You need a good "radiator" cap for the heat cycles to fill the system properly - and keep the white tank supplied with coolant. __________________ “Buy the best example of what you want, and pay whatever it takes. That way, you cry only once.” ~ Bruce Meyer

01-03-2010	#6
jonszr1 Join Date: Sep 2006 Location: lone pine and mammoth lakes Posts: 1,406	Re: NO HEAT thanx for the rad cap addition i forgot about that one

01-04-2010	#8
jonszr1 Join Date: Sep 2006 Location: lone pine and mammoth lakes Posts: 1,406	Re: NO HEAT i have to replace the heater core on my 90, its leakin . looks like you have to remove everything in the dash to get it out .? anyone done this project ?and have any help on what probs crop up ??????

01-04-2010	#10
phrogs Join Date: Jul 2004 Location: Kalamazoo MI Posts: 1,763	Re: NO HEAT Its a job from hell but it can be done. The heater core sits inside of a black plastic shell and you will have to remove the dash to get to it. __________________ JOHNNY P Currently own 90 ZR-1 #845 DRM 500 engine package 90 #226 Parts car Hit me up if you need anything.