how is this product installed?

Not sure if you meant used rather than installed. You need a set of A/C gauges. It is a bit tedious to explain. You will on see that on these gauges that you have 3 hoses, 1 goes to high pressure (red), one goes to low pressure (blue) and one goes to the Freon Canister (yellow). You need to pour appropriate amount of dye in the yellow hose before screwing it on the set of gauges (opposite to the end that would go on the Freon canister). Try to find a video on the subject. It will be easier.

After putting it in I don't see any leaks. How long does it take to be able to spot a leak?

Thank you for submitting your question, please be advised that after following the instructions you should notice the leak within a couple of minutes. For any further information please reach out to us on 800-776-1530 or autohelpline@energizer.com to assist you better. A/C Pro Consumer Services. Thank you!

What UV wave length of a light source be the best?

This is the flashlight I purchase for detection https://www.amazon.com/gp/product/B07V5QZDKW/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Can i put this on my water reservoir to find a leak in my car cooling system? (not planning to use it on ac)

I would not do it. Use a pressure tester. Pump it up and search. The reason for a dye in your ac system is because its gas that leaks. I have this pressure tester and it is worth the money. All the caps are metal or aluminium. https://www.amazon.com/dp/B08SQ97DGT?ref=ppx_pop_mob_ap_share

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🔧 Detect leaks before they detect you – stay cool, stay ahead!

COMPACT EFFICIENT - Four precise .25 oz doses ensure multiple leak detection sessions without waste
OIL FRIENDLY FORMULA - Compatible with all PAG, ester, and mineral-based refrigerant oils for worry-free use
INDUSTRY TRUSTED STANDARD - Meets SAE J2297 certification for reliable, professional-grade performance
PINPOINT LEAKS LIKE A PRO - UV dye reveals hidden A/C leaks instantly under blacklight
UNIVERSAL SYSTEM COMPATIBILITY - Seamlessly works with all major refrigerants including R-12, R-134a, and R-22

Certified A/C Pro Leak Detector Dye is a professional-grade UV dye designed for automotive air conditioning systems. It offers four precise .25 oz applications compatible with R-12, R-134a, and R-22 refrigerants and all major refrigerant oils. Meeting SAE J2297 standards, it ensures accurate, efficient leak detection to keep your A/C system running flawlessly.

€ 15.46

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Slovakiastore

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TrustScore 4.5 | 7,300+ reviews

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Fantastic and great service. Shipping was faster than expected.

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Brand	A/C Pro
Style	Modern
Power Source	Corded Electric
Item Weight	0.02 Pounds
Alarm	Visual
Global Trade Identification Number	00047876013765, 10047876013762
Number of Items	1
Manufacturer	QUEST
UPC	047876013765
Model	376CS
Item Weight	0.32 ounces
Product Dimensions	5.5 x 2.8 x 0.3 inches
Item model number	376CS
Is Discontinued By Manufacturer	No
Manufacturer Part Number	376CS
Position	Outside

Certified A/C Pro Car Air Conditioner Leak Detector Dye, Detection UV Dye Detects Leaks in R-12 and R-134A Condition Systems, 1 Oz

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