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1999 Frontier needs frequent coolant added but passed a

Hi. 1999 Frontier needs frequent...
Hi. 1999 Frontier needs frequent coolant added but passed a pressure test. Totally overheated a few months ago when I didn't know coolant was low. Otherwise runs well. Possible sources?
JA: Have you checked the coolant? Have you checked for a leak in the cooling system?
Customer: Yes. No visible leak; Passes a pressure test. I top off coolant weekly.
JA: Are you fixing your Frontier yourself? What have you tried so far?
Customer: I have a retired Honda mechanic who has maintained it for years, but he doesn't want me to put any money in the truck. I need it for dump runs etc. So I'm doing what I can myself.
JA: Anything else you want the mechanic to know before I connect you?
Customer: I just stumbled on this on the web. Is there a fee coming up?
JA: You just pay a $5 deposit now and the rest only when you get a reply from the Nissan Mechanic. All of this is 100% satisfaction guaranteed, so you can get a refund if you're not happy for any reason.
Customer: "the rest"?
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Answered in 3 minutes by:
11/18/2017
Nissan_Service
Nissan_Service, Service Manager
Category: Nissan
Satisfied Customers: 5,000
Experience: 14 years experience at a Nissan Dealership
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Hello. Welcome to Just Answer. Please allow me to assist you. Please advise of what type of pressure test was performed. Thanks!

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Customer reply replied 25 days ago
I don't know what to say. He put a small gizmo on the tube coming out of the radiator and left it on for an hour. Said pressure did not go down so not a leak.
Customer reply replied 25 days ago
thanks. I'm going to take it to a Nissan independent; get it done right.

Ok, thank you. That is a cooling system pressure test. Since this test produces no leaks, you either have a faulty/sticking thermostat (allowing the engine temperature to rise too far; this causes the coolant to be expelled from the overflow bottle. Or, you have a slight seepage at the cylinder head gasket. The gasket, if seeping, will allow coolant to enter the cylinders and be expelled thru the exhaust.

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I would recommend a cylinder head gasket integrity/pressure test next.

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If you do have any questions, please reply. If you are satisfied with my input on your request, thanks for choosing Just Answer. It was a pleasure to assist you today. I trust my input to your request is satisfactory to you and meets your expectations.

Nissan_Service
Nissan_Service, Service Manager
Category: Nissan
Satisfied Customers: 5,000
Experience: 14 years experience at a Nissan Dealership
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